Replace with string.Empty

Author: IvenBach

Rubberduck.RegexAssistant/QuantifierExtensions.cs

@@ -31,7 +31,7 @@ public static string HumanReadable(this Quantifier quant)
                     }
                     return string.Format(AssistantResources.Quantifier_ClosedRange, quant.MinimumMatches, quant.MaximumMatches);
             }
-            return "";
+            return string.Empty;
         }
     }
 }