No need to return args as part of task.get

This reverts commit 831e22b4ff.
This reverts commit 6774514bd2.

src/apps.js

@@ -648,6 +648,7 @@ function checkAppState(app, state) {
     if (app.taskId) return new BoxError(BoxError.BAD_STATE, `Locked by task ${app.taskId} : ${app.installationState} / ${app.runState}`);
 
     if (app.installationState === exports.ISTATE_ERROR) {
+        // allow task to be called again if that was the errored task
         if (app.error.installationState === state) return null;
 
         // allow uninstall from any state