Only set rdt config if it was passed in intent

Author: vincent-karuri

lib/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/activities/ImageQualityActivity.java

@@ -50,7 +50,10 @@ protected void onCreate(Bundle savedInstanceState) {
 
         try {
             // Extract config json obj
-            mImageQualityView.setRdtJsonConfig(new JSONObject(b.getString(RDT_JSON_CONFIG)));
+            String rdtConfig = b.getString(RDT_JSON_CONFIG, null);
+            if (rdtConfig != null) {
+                mImageQualityView.setRdtJsonConfig(new JSONObject(rdtConfig));
+            }
         } catch (JSONException e) {
             e.printStackTrace();
         }