fix: missing var declarations raised errors

src/QueryGenerators.js

@@ -107,6 +107,7 @@
 			objectVarIndex = ArrayLiIndex[index] + 1 ;
 		}
 
+		var subjectVariable = "";
 		// name start and end variables
 		// dashes should be replaced
 		if (subjectVariableIndex == 0) {
@@ -269,7 +270,7 @@
 		};
 
 		// add additionnal prefixes
-		for (key in this.additionnalPrefixes) {
+		for (var key in this.additionnalPrefixes) {
 	        jsonQuery.prefixes[key] = this.additionnalPrefixes[key];
     	}