Reset isForkingSandbox on error (codesandbox#1859)

* Reset isForkingSandbox on error

Close codesandbox#1803.

I'm not sure what's the best way to reset some state on error with Cerebral though.
Basically, I'd like to be able to always reset this state at the end of the `forkSandbox` sequence (https://github.com/codesandbox/codesandbox-client/blob/master/packages/app/src/app/store/sequences.js#L162) instead of doing this in every single action called by this sequence.

* Use path for success/error

Author: ValentinH

packages/app/src/app/store/actions.js

@@ -168,15 +168,16 @@ export function getGitChanges({ api, state }) {
     .then(gitChanges => ({ gitChanges }));
 }
 
-export function forkSandbox({ state, props, api }) {
+export function forkSandbox({ state, props, api, path }) {
   const sandboxId = props.sandboxId || state.get('editor.currentId');
   const url = sandboxId.includes('/')
     ? `/sandboxes/fork/${sandboxId}`
     : `/sandboxes/${sandboxId}/fork`;
 
   return api
     .post(url, props.body || {})
-    .then(data => ({ forkedSandbox: data }));
+    .then(data => path.success({ forkedSandbox: data }))
+    .catch(error => path.error({ error }));
 }
 
 export function moveModuleContent({ props, state }) {

packages/app/src/app/store/sequences.js

@@ -166,13 +166,18 @@ export const forkSandbox = sequence('forkSandbox', [
       factories.track('Fork Sandbox', {}),
       set(state`editor.isForkingSandbox`, true),
       actions.forkSandbox,
-      actions.moveModuleContent,
-      setSandboxData,
-      set(state`editor.currentId`, props`sandbox.id`),
-      factories.addNotification('Forked sandbox!', 'success'),
-      factories.updateSandboxUrl(props`sandbox`),
-      ensurePackageJSON,
-      set(state`editor.isForkingSandbox`, false),
+      {
+        success: [
+          actions.moveModuleContent,
+          setSandboxData,
+          set(state`editor.currentId`, props`sandbox.id`),
+          factories.addNotification('Forked sandbox!', 'success'),
+          factories.updateSandboxUrl(props`sandbox`),
+          ensurePackageJSON,
+          set(state`editor.isForkingSandbox`, false),
+        ],
+        error: set(state`editor.isForkingSandbox`, false),
+      },
     ],
     false: [
       factories.track('Show Server Fork Sign In Modal', {}),