fix unit test

Author: SadiHassan

src/Parsers/tests/KQL/gtest_KQL_StringFunctions.cpp

@@ -220,7 +220,6 @@ INSTANTIATE_TEST_SUITE_P(ParserKQLQuery_String, ParserTest,
         },
         {
             "Customers | project name_abbr = strcat(substring(FirstName,0,3), ' ', substring(LastName,2))| order by LastName",
-            "SELECT concat(if(toInt64(length(FirstName)) = 0, '', substr(FirstName, (((0 % toInt64(length(FirstName))) + toInt64(length(FirstName))) % toInt64(length(FirstName))) + 1, 3)), ' ', if(toInt64(length(LastName)) = 0, '', substr(LastName, (((2 % toInt64(length(LastName))) + toInt64(length(LastName))) % toInt64(length(LastName))) + 1))) AS name_abbr\nFROM Customers\nORDER BY LastName DESC"
+            "SELECT concat(if(toInt64(length(FirstName)) <= 0, '', substr(FirstName, (((0 % toInt64(length(FirstName))) + toInt64(length(FirstName))) % toInt64(length(FirstName))) + 1, 3)), ' ', if(toInt64(length(LastName)) <= 0, '', substr(LastName, (((2 % toInt64(length(LastName))) + toInt64(length(LastName))) % toInt64(length(LastName))) + 1))) AS name_abbr\nFROM Customers\nORDER BY LastName DESC"
         }
-})));   
-
+})));