Improve fixing thrown errors

src/main/java/com/lbry/globe/api/API.java

@@ -4,6 +4,7 @@ import com.lbry.globe.object.Node;
 import com.lbry.globe.object.Service;
 
 import java.io.BufferedReader;
+import java.io.File;
 import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.net.Inet6Address;
@@ -42,8 +43,10 @@ public class API{
     }
 
     public static void loadNodes(){
+        File file = new File("nodes.json");
+        if(file.exists()){
             try{
-            BufferedReader br = new BufferedReader(new FileReader("nodes.json"));
+                BufferedReader br = new BufferedReader(new FileReader(file));
                 StringBuilder sb = new StringBuilder();
                 String line;
                 while((line = br.readLine())!=null){
@@ -58,6 +61,7 @@ public class API{
                 API.LOGGER.log(Level.WARNING,"Failed loading nodes.",e);
             }
         }
+    }
 
     public static void saveNodes(){
         try{

src/main/java/com/lbry/globe/thread/BlockchainNodeFinderThread.java

@@ -3,6 +3,7 @@ package com.lbry.globe.thread;
 import com.lbry.globe.api.API;
 import com.lbry.globe.object.Node;
 import com.lbry.globe.object.Service;
+import com.lbry.globe.util.Environment;
 import com.lbry.globe.util.GeoIP;
 
 import java.io.BufferedReader;
@@ -20,11 +21,13 @@ public class BlockchainNodeFinderThread implements Runnable{
 
     @Override
     public void run(){
+        String rpcURL = Environment.getVariable("BLOCKCHAIN_RPC_URL");
+        if(rpcURL!=null){
             while(true){
                 try{
-                HttpURLConnection conn = (HttpURLConnection) new URI(System.getenv("BLOCKCHAIN_RPC_URL")).toURL().openConnection();
+                    HttpURLConnection conn = (HttpURLConnection) new URI(rpcURL).toURL().openConnection();
                     conn.setDoOutput(true);
-                conn.addRequestProperty("Authorization","Basic "+ Base64.getEncoder().encodeToString((System.getenv("BLOCKCHAIN_USERNAME")+":"+System.getenv("BLOCKCHAIN_PASSWORD")).getBytes()));
+                    conn.addRequestProperty("Authorization","Basic "+ Base64.getEncoder().encodeToString((Environment.getVariable("BLOCKCHAIN_USERNAME")+":"+Environment.getVariable("BLOCKCHAIN_PASSWORD")).getBytes()));
                     conn.connect();
                     conn.getOutputStream().write(new JSONObject().put("id",new Random().nextInt()).put("method","getnodeaddresses").put("params",new JSONArray().put(2147483647)).toString().getBytes());
                     InputStream in = conn.getInputStream();
@@ -49,6 +52,7 @@ public class BlockchainNodeFinderThread implements Runnable{
                 }
             }
         }
+    }
 
     public void manageBlockchainNodes(JSONArray nodes){
         Map<InetAddress,JSONObject> data = new TreeMap<>(Comparator.comparing(InetAddress::getHostAddress));

src/main/java/com/lbry/globe/util/Environment.java

@@ -0,0 +1,17 @@
+package com.lbry.globe.util;
+
+public class Environment{
+
+    public static String getVariable(String key){
+        return Environment.getVariable(key,null);
+    }
+
+    public static String getVariable(String key,String defaultValue){
+        String value = System.getenv(key);
+        if(value==null){
+            return defaultValue;
+        }
+        return value;
+    }
+
+}

src/main/java/com/lbry/globe/util/GeoIP.java

@@ -14,7 +14,7 @@ public class GeoIP{
 
     private static final Map<InetAddress,JSONObject> CACHE = new TreeMap<>(Comparator.comparing(InetAddress::getHostAddress));
     private static final Logger LOGGER = Logger.getLogger("GeoIP");
-    private static final String TOKEN = System.getenv("IPINFO_TOKEN");
+    private static final String TOKEN = Environment.getVariable("IPINFO_TOKEN");
 
     public static JSONObject getCachedGeoIPInformation(InetAddress ip){
         JSONObject result = CACHE.get(ip);
@@ -33,7 +33,12 @@ public class GeoIP{
     public static JSONObject getGeoIPInformation(InetAddress ip) throws IOException,URISyntaxException{
         HttpURLConnection conn = (HttpURLConnection) new URI("https://ipinfo.io/"+ip.getHostAddress()+"?token="+GeoIP.TOKEN).toURL().openConnection();
         conn.connect();
-        InputStream in = conn.getInputStream();
+        InputStream in = null;
+        try{
+            in = conn.getInputStream();
+        }catch(Exception e){
+            GeoIP.LOGGER.log(Level.WARNING,"GeoIP service returned status code '"+conn.getResponseCode()+"'.");
+        }
         if(in==null){
             in = conn.getErrorStream();
         }
@@ -56,8 +61,10 @@ public class GeoIP{
     }
 
     public static void loadCache(){
+        File file = new File("geoip.json");
+        if(file.exists()){
             try{
-            BufferedReader br = new BufferedReader(new FileReader("geoip.json"));
+                BufferedReader br = new BufferedReader(new FileReader(file));
                 StringBuilder sb = new StringBuilder();
                 String line;
                 while((line = br.readLine())!=null){
@@ -72,6 +79,7 @@ public class GeoIP{
                 GeoIP.LOGGER.log(Level.WARNING,"Failed loading GeoIP cache.",e);
             }
         }
+    }
 
     public static void saveCache(){
         try{