fixed emty search query on suggestions error

app/src/main/java/org/schabi/newpipe/VideoItemListActivity.java

@@ -108,7 +108,9 @@ public class VideoItemListActivity extends AppCompatActivity
 
         @Override
         public boolean onQueryTextChange(String newText) {
-            searchSuggestions(newText);
+            if(!newText.isEmpty()) {
+                searchSuggestions(newText);
+            }
             return true;
         }