Added config file existence check

Author: PeratX

app/build.gradle

@@ -52,7 +52,7 @@ dependencies {
     compile 'org.pcap4j:pcap4j-core:1.7.0'
     compile 'org.pcap4j:pcap4j-packetfactory-propertiesbased:1.7.0'
     compile 'de.measite.minidns:minidns-core:0.2.1'
-    compile 'com.google.code.gson:gson:2.8.0'
+    compile 'com.google.code.gson:gson:2.8.1'
 
     compile 'com.google.firebase:firebase-crash:10.2.6'
 

app/src/main/java/org/itxtech/daedalus/fragment/DnsTestFragment.java

@@ -130,7 +130,7 @@ public void run() {
 
 
             private StringBuilder testServer(DNSQuery dnsQuery, Record.TYPE type, String server, String domain, StringBuilder testText) {
-                Logger.debug("Testing DNS server" + server);
+                Logger.debug("Testing DNS server " + server);
                 testText.append(getString(R.string.test_domain)).append(" ").append(domain).append("\n").append(getString(R.string.test_dns_server)).append(" ").append(server);
 
                 mHandler.obtainMessage(DnsTestHandler.MSG_DISPLAY_STATUS, testText.toString()).sendToTarget();

app/src/main/java/org/itxtech/daedalus/util/Configurations.java

@@ -125,11 +125,13 @@ public int getUsingRuleType() {
     public static Configurations load(File file) {
         Configurations.file = file;
         Configurations config = null;
-        try {
-            config = Daedalus.parseJson(Configurations.class, new JsonReader(new FileReader(file)));
-            Logger.info("Loading configuration successfully from " + file);
-        } catch (Exception e) {
-            Logger.logException(e);
+        if (file.exists()) {
+            try {
+                config = Daedalus.parseJson(Configurations.class, new JsonReader(new FileReader(file)));
+                Logger.info("Loading configuration successfully from " + file);
+            } catch (Exception e) {
+                Logger.logException(e);
+            }
         }
 
         if (config == null) {