Fixed app crash caused by multiple callback invocation from java code. (#1289)

Added CodePushUtils.log method for logging exceptions.

Author: NickToropov

android/app/src/main/java/com/microsoft/codepush/react/CodePushDialog.java

@@ -57,16 +57,20 @@ private void showDialogInternal(String title, String message, String button1Text
         DialogInterface.OnClickListener clickListener = new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
-                dialog.cancel();
-                switch (which) {
-                    case DialogInterface.BUTTON_POSITIVE:
-                        successCallback.invoke(0);
-                        break;
-                    case DialogInterface.BUTTON_NEGATIVE:
-                        successCallback.invoke(1);
-                        break;
-                    default:
-                        throw new CodePushUnknownException("Unknown button ID pressed.");
+                try {
+                    dialog.cancel();
+                    switch (which) {
+                        case DialogInterface.BUTTON_POSITIVE:
+                            successCallback.invoke(0);
+                            break;
+                        case DialogInterface.BUTTON_NEGATIVE:
+                            successCallback.invoke(1);
+                            break;
+                        default:
+                            throw new CodePushUnknownException("Unknown button ID pressed.");
+                    }
+                } catch (Throwable e) {
+                    CodePushUtils.log(e);
                 }
             }
         };

android/app/src/main/java/com/microsoft/codepush/react/CodePushUtils.java

@@ -203,6 +203,10 @@ public static void log(String message) {
         Log.d(CodePushConstants.REACT_NATIVE_LOG_TAG, "[CodePush] " + message);
     }
 
+    public static void log(Throwable tr) {
+        Log.e(CodePushConstants.REACT_NATIVE_LOG_TAG, "[CodePush] Exception", tr);
+    }
+
     public static void logBundleUrl(String path) {
         log("Loading JS bundle from \"" + path + "\"");
     }