HPCC-22687 Allow SKIP(FALSE) on a ROW TRANSFORM

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

ecl/hqlcpp/hqlhtcpp.cpp

@@ -9070,7 +9070,7 @@ void HqlCppTranslator::doBuildStmtSkip(BuildCtx & ctx, IHqlExpression * expr, bo
                     *canReachFollowing = false;
             }
         }
-        else
+        else if (!cond || !matchesBoolean(cond, false))
             throwError(HQLERR_SkipNotValidHere);
     }
 }