Fix for related query on non-existing column

spec/ParseRole.spec.js

@@ -119,5 +119,25 @@ describe('Parse Role testing', () => {
     });
   });
 
+  it('can create role and query empty users', (done)=> {
+    var roleACL = new Parse.ACL();
+    roleACL.setPublicReadAccess(true);
+    var role = new Parse.Role('subscribers', roleACL);
+    role.save({}, {useMasterKey : true})
+      .then((x)=>{
+        var query = role.relation('users').query();
+        query.find({useMasterKey : true})
+          .then((users)=>{
+            done();
+          }, (e)=>{
+            fail('should not have errors');
+            done();
+          });
+      }, (e) => {
+        console.log(e);
+        fail('should not have errored');
+      });
+  });
+
 });
 

src/Controllers/DatabaseController.js

@@ -89,7 +89,7 @@ DatabaseController.prototype.loadSchema = function(acceptor = returnsTrue) {
 DatabaseController.prototype.redirectClassNameForKey = function(className, key) {
   return this.loadSchema().then((schema) => {
     var t = schema.getExpectedType(className, key);
-    var match = t.match(/^relation<(.*)>$/);
+    var match = t ? t.match(/^relation<(.*)>$/) : false;
     if (match) {
       return match[1];
     } else {