protect plugmatic from ill-formed about page json

[WardCunningham]

I'm having a strange problem with wiki-plugin-frame and plugmatic.
I got a version published on NPM: 0.1.0. And plugmatic happily installs it:

Here you can see the wiki logs where plugmatic installs it, I click the restart button in the web UI and then the first few lines after I reload the web page:

plugmatic installing wiki-plugin-frame@0.1.0
POST /plugin/plugmatic/install 200 2202 - 2254.486 ms
plugmatic exit to restart
restarting wiki server
Wiki starting in Farm mode, navigate to a specific server to start it.

friends starting
[ { _: {},
    autoseed: false,
    test: false,
    help: false,
...

That all worked great.

Then I improved the about page, tried npm version patch and republished version 0.1.1. But plugmatic crashed wiki when I tried to install that one. I tried again with 0.1.2 and still getting plugmatic crashing:

Here you can see the wiki log where plugmatic blows up:

plugmatic installing wiki-plugin-frame@0.1.2

 TypeError: Cannot read property 'title' of null
    at /home/app/lib/node_modules/wiki/node_modules/wiki-plugin-plugmatic/server/server.js:74:26
    at /home/app/lib/node_modules/wiki/node_modules/jsonfile/index.js:42:16
    at /home/app/lib/node_modules/wiki/node_modules/graceful-fs/graceful-fs.js:78:16
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:511:3)


server unexpectly exitted, 122 (1)
wiki_farm_1 exited with code 1

the commits are here in case anyone can spot what's causing the crash:
https://github.com/dobbs/wiki-plugin-frame/commits/master
Ah... I found my cause. I manually edited the journal on the about page and left a trailing comma.

This commit fixed it.
dobbs/wiki-plugin-frame@6e0178c

So... wiki-plugin-frame version 0.1.3 is now available and installing correctly with plugmatic

Plugmatic wasn't much help there was it? I'll copy this discussion into an issue.

[WardCunningham]

This is a trap where if you install a version that kills Plugmatic then you can't install it. Yuck.