Fix possible null reference

Author: Jack251970

Flow.Launcher/Storage/UserSelectedRecord.cs

@@ -51,6 +51,11 @@ private static int GenerateResultHashCode(Result result)
 
         private static int GenerateQueryAndResultHashCode(Query query, Result result)
         {
+            if (query == null)
+            {
+                return GenerateResultHashCode(result);
+            }
+
             int hashcode = GenerateStaticHashCode(query.ActionKeyword);
             hashcode = GenerateStaticHashCode(query.Search, hashcode);
             hashcode = GenerateStaticHashCode(result.Title, hashcode);
@@ -101,4 +106,4 @@ public int GetSelectedCount(Result result)
             return selectedCount;
         }
     }
-}
+}