Merge pull request #1174 from hismaeel/1130(b)

issue #1130 (b)

Author: neslihanturan

app/src/main/java/fr/free/nrw/commons/media/MediaDetailFragment.java

@@ -14,6 +14,7 @@
 import android.widget.LinearLayout;
 import android.widget.ScrollView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import java.io.IOException;
 import java.text.SimpleDateFormat;
@@ -273,7 +274,12 @@ private void setTextFields(Media media) {
     }
 
     private void setOnClickListeners(final Media media) {
-        license.setOnClickListener(v -> openWebBrowser(licenseLink(media)));
+        if (licenseLink(media) != null) {
+            license.setOnClickListener(v -> openWebBrowser(licenseLink(media)));
+            } else {
+            Toast toast = Toast.makeText(getContext(), getString(R.string.null_url), Toast.LENGTH_SHORT);
+            toast.show();
+            }
         if (media.getCoordinates() != null) {
             coordinates.setOnClickListener(v -> openMap(media.getCoordinates()));
         }

app/src/main/res/values/strings.xml

@@ -224,6 +224,7 @@
   <string name="login_to_your_account">Login to your account</string>
   <string name="send_log_file">Send log file</string>
   <string name="send_log_file_description">Send log file to developers via email</string>
+  <string name="null_url">Error! URL not found</string>
 
   <string name="nearby_location_has_not_changed">Location has not changed.</string>
   <string name="nearby_location_not_available">Location not available.</string>