Conversation Edit JQuery Bug: `Uncaught TypeError: Cannot read property '$element' of undefined`

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When editing an existing conversation comment, each keystroke will generate a TypeError. When you try to save the edited comment, sometimes you will get a "An unspecified error occurred."

# To Replicate
1. Start any C5 install (from 8.5.0 to 8.5.2, a standard demo site on cloud.concrete5.io can sufffice)
2. Go to page that has a comment box, e.g. the Hello World blog post.
3. Type in a comment and save it.
4. Click Edit to edit the comment.
5. Open a developer web console in your browser.
6. Start typing. Each keystroke will generate an error, e.g.:

```
VM431:16 Uncaught TypeError: Cannot read property '$element' of undefined
at HTMLTextAreaElement.eval (eval at <anonymous> (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:2), <anonymous>:16:62)
at HTMLTextAreaElement.dispatch (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
at HTMLTextAreaElement.r.handle (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
eval @ VM431:16
dispatch @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
r.handle @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
22:05:42.444 VM431:29 Uncaught TypeError: Cannot read property 'tool' of undefined
at HTMLTextAreaElement.eval (eval at <anonymous> (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:2), <anonymous>:29:20)
at HTMLTextAreaElement.dispatch (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
at HTMLTextAreaElement.r.handle (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
eval @ VM431:29
dispatch @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
r.handle @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
22:05:42.552 VM431:16 Uncaught TypeError: Cannot read property '$element' of undefined
at HTMLTextAreaElement.eval (eval at <anonymous> (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:2), <anonymous>:16:62)
at HTMLTextAreaElement.dispatch (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
at HTMLTextAreaElement.r.handle (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
eval @ VM431:16
dispatch @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
r.handle @ jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3
22:05:42.688 VM431:29 Uncaught TypeError: Cannot read property 'tool' of undefined
at HTMLTextAreaElement.eval (eval at <anonymous> (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:2), <anonymous>:29:20)
at HTMLTextAreaElement.dispatch (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
at HTMLTextAreaElement.r.handle (jquery.js?ccm_nocache=c2f810f838c393a212b03734e81cad1b159e6ccc:3)
```

7. Click Save
Sometimes the text will be saved. But sometimes you get an "An unspecified error occurred." and the text will not be saved.


Status: New

concrete5 Environment Information

# concrete5 Version
Core Version - 8.5.1
Version Installed - 8.5.1
Database Version - 20190301133300

# concrete5 Packages
SimpleSite Package (1.0.1)

# concrete5 Overrides
views/simplesite_default_view.php

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - Off
Full Page Cache Lifetime - Every 6 hours (default setting).

# Server Software
nginx/1.8.1

# Server API
fpm-fcgi

# PHP Version
5.6.28

# PHP Extensions
bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, gmp, hash, iconv, json, libxml, mbstring, mhash, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, Reflection, session, shmop, SimpleXML, sockets, SPL, sqlite3, standard, tokenizer, wddx, xml, xmlreader, xmlwriter, xsl, zip, zlib

# PHP Settings
max_execution_time - 30
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 256M
post_max_size - 8M
sql.safe_mode - Off
upload_max_filesize - 2M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - <i>no value</i>
session.gc_maxlifetime - 7200

Browser User-Agent String

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.97 Safari/537.36