Update combine_ways.test.js

Author: Beakerboy

test/combine_ways.test.js

@@ -103,6 +103,9 @@ describe.each([
     }
     let result = BuildingShapeUtils.combineWays(xml);
     expect(result.length).toBe(length);
+    if (errorMsgs.length) {
+      expect(errorMsgs[0]).toBe('');
+    }
     expect(errorMsgs.length).toBe(errors.length);
     if (errors.length) {
       // Check that message text matches.