#810 - Handle output which is not JSON in many linters

test/handler/test_embertemplatelint_handler.vader

@@ -75,9 +75,11 @@ Execute(The ember-template-lint handler should handle template parsing error cor
 
 Execute(The ember-template-lint handler should handle no lint errors/warnings):
   AssertEqual
-  \ [
-  \ ],
+  \ [],
   \ ale_linters#handlebars#embertemplatelint#Handle(347, [])
+  AssertEqual
+  \ [],
+  \ ale_linters#handlebars#embertemplatelint#Handle(347, ['{}'])
 
 After:
   call ale#linter#Reset()