Fix macro syntax bug in app templates

qcode/cleanup.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+cd corpus && rm -rf $(find . ! -name '00?.gql')

qcode/qcode.go

@@ -577,7 +577,7 @@ func (com *Compiler) compileArgID(sel *Select, arg *Arg) error {
 	case nodeVar:
 		ex.Type = ValVar
 	default:
-		fmt.Errorf("expecting a string, int, float or variable")
+		return fmt.Errorf("expecting a string, int, float or variable")
 	}
 
 	sel.Where = ex