fix(box): ignore node_modules/ & .git/ in themes

[curbengh]

What does it do?

Continuation of #3797

Supersedes and closes hexojs/hexo-starter#30 cc @dailyrandomphoto

Related: #3885 hexojs/hexo-server#45 hexojs/hexo-server#43

How to test

cc @shen-yu

package.json
-  "hexo": "^4.1.0",
+  "hexo": "curbengh/hexo#ignore-theme-node",

2. rm -f package-lock.json && rm -rf node_modules/
3. npm install
4. hexo clean && hexo server

Maintainers only:

git clone -b ignore-theme-node https://github.com/curbengh/hexo.git
cd hexo
npm install
npm test

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[coveralls]

Coverage increased (+0.006%) to 97.137% when pulling a5c42d0 on curbengh:ignore-theme-node into c19096b on hexojs:master.

[curbengh]

As I couldn't reproduce the original issue, I will mark this ready for review after affected users have confirmed this PR does fix the issue.

[dailyrandomphoto]

As I couldn't reproduce the original issue, I will mark this ready for review after affected users have confirmed this PR does fix the issue.

It works for me.

[curbengh]

The benchmark finished a lot quicker than usual.

Iterating through merged PRs, it starts from #3926.

We need to test the master branch in a test blog.

[SukkaW]

@curbengh I am already working on it.

---

TypeError: Cannot convert undefined or null to object
    at Function.keys (<anonymous>)
    at Hexo.postPermalinkFilter (/mnt/d/Project/Sukka/hexo-theme-unit-test/node_modules/hexo/lib/plugins/filter/post_permalink.js:46:24)
    at Filter.execSync (/mnt/d/Project/Sukka/hexo-theme-unit-test/node_modules/hexo/lib/extend/filter.js:75:28)

[curbengh]

It's from #3926, need null-check on config.permalink_defaults.

[curbengh]

Since you're working on it, feel free to submit fix.