Return args as part of task.get

the ui needs this to repair any failed app task

src/apps.js

@@ -648,6 +648,9 @@ function checkAppState(app, state) {
     if (app.taskId) return new BoxError(BoxError.BAD_STATE, `Not allowed in this app state : ${app.installationState} / ${app.runState}`);
 
     if (app.installationState === exports.ISTATE_ERROR) {
+        if (app.error.installationState === state) return null;
+
+        // allow uninstall from any state
         if (state !== exports.ISTATE_PENDING_UNINSTALL) return new BoxError(BoxError.BAD_STATE, 'Not allowed in error state');
     }