Preview Issue Description: bug appears when navigating on comment link

[Shchs]

Hi There!
Dear Developers, could you fix an error I'll describe below.

Environment:

JIRA v7.3.0

Preview Issue Description v1.0.2

How to reproduce (step by step):

1. Install Plugin

2. Open Jira Board which contains issues comments.

3. Navigate cursor to comment link

Log:

An error occurredHide…(3)

Please try refreshing the page, or contact your administrator / Atlassian Support if the problem continues.

Details

1. • Exception: Uncaught TypeError: Cannot read property 'description' of undefined
   • Resource: http://issues.local/s/b1492b4cef2b6f2c9c7437b43048e6f0-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/f3fd896a532f4b479736bc84976f8c5e/_/download/contextbatch/js/greenhopper-rapid-non-gadget,atl.general,jira.global,gh-rapid,jira.project.sidebar,com.atlassian.jira.projects.sidebar.init,jira.general,-_super/batch.js?agile_global_admin_condition=true&healthcheck-resources=true&is-server-instance=true&is-system-admin=true&jag=true&jaguser=true&locale=en-US&nps-acknowledged=true&nps-not-opted-out=...
   • Line: 2661
   • Column: 903
2. • Exception: Uncaught TypeError: Cannot read property 'description' of undefined
   • Resource: http://issues.local/s/b1492b4cef2b6f2c9c7437b43048e6f0-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/f3fd896a532f4b479736bc84976f8c5e/_/download/contextbatch/js/greenhopper-rapid-non-gadget,atl.general,jira.global,gh-rapid,jira.project.sidebar,com.atlassian.jira.projects.sidebar.init,jira.general,-_super/batch.js?agile_global_admin_condition=true&healthcheck-resources=true&is-server-instance=true&is-system-admin=true&jag=true&jaguser=true&locale=en-US&nps-acknowledged=true&nps-not-opted-out=...
   • Line: 2661
   • Column: 903
3. • Exception: Uncaught TypeError: Cannot read property 'description' of undefined
   • Resource: http://issues.local/s/b1492b4cef2b6f2c9c7437b43048e6f0-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/f3fd896a532f4b479736bc84976f8c5e/_/download/contextbatch/js/greenhopper-rapid-non-gadget,atl.general,jira.global,gh-rapid,jira.project.sidebar,com.atlassian.jira.projects.sidebar.init,jira.general,-_super/batch.js?agile_global_admin_condition=true&healthcheck-resources=true&is-server-instance=true&is-system-admin=true&jag=true&jaguser=true&locale=en-US&nps-acknowledged=true&nps-not-opted-out=...
   • Line: 2661
   • Column: 903

Environment

Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36

Stack trace

• TypeError: Cannot read property 'description' of undefined
• at Object. (http://issues.local/s/b1492b4cef2b6f2c9c7437b43048e6f0-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/f3fd896a532f4b479736bc84976f8c5e/_/download/contextbatch/js/greenhopper-rapid-non-gadget,atl.general,jira.global,gh-rapid,jira.project.sidebar,com.atlassian.jira.projects.sidebar.init,jira.general,-_super/batch.js?agile_global_admin_condition=true&healthcheck-resources=true&is-server-instance=true&is-system-admin=true&jag=true&jaguser=true&locale=en-US&nps-acknowledged=true&nps-not-opted-out=...)
• at j (http://issues.local/s/78738d7dc3f0a2ce5e316714f9b820a6-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/37349e9a9cbfc01728a437b4360de3e8/_/download/contextbatch/js/_super/batch.js?locale=en-US:60:58)
• at Object.fireWith [as resolveWith] (http://issues.local/s/78738d7dc3f0a2ce5e316714f9b820a6-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/37349e9a9cbfc01728a437b4360de3e8/_/download/contextbatch/js/_super/batch.js?locale=en-US:61:361)
• at d (http://issues.local/s/78738d7dc3f0a2ce5e316714f9b820a6-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/37349e9a9cbfc01728a437b4360de3e8/_/download/contextbatch/js/_super/batch.js?locale=en-US:186:292)
• at XMLHttpRequest.b (http://issues.local/s/78738d7dc3f0a2ce5e316714f9b820a6-CDN/zex2a0/73011/ffa597d2e225041431c87b5979cd87f0/37349e9a9cbfc01728a437b4360de3e8/_/download/contextbatch/js/_super/batch.js?locale=en-US:198:149)

[Shchs · Accepted solution]

Fixed (version 1.0.3): https://denizoguz.atlassian.net/browse/PREV-4