Do not run empty ta's test stub.

plugins/ta/spec/ta.spec.fish

@@ -9,10 +9,8 @@ function describe_ta -d "ta: to-done task manager"
     end
 
     function it_does_something
-      ta -h
-      expect $status --to-equal 0
     end
 
 end
 
-spec.run $argv
+# spec.run $argv