When using ContentTranslation (master), console log throws uncaught TypeError. Seen in local and cx2 (labs) setup.
== How to reproduce ==
* Go to cx2-testing.wmflabs.org
* Start an article to translate. Select (en->gl) pair for example (where we've Apertium available).
* Click on paragraph to translate. Open console. Following error is observerd.
== Log ==
```
Uncaught TypeError: Cannot read property 'contains' of undefined
at CXIssueTrackingTool.mw.cx.tools.IssueTrackingTool.getCurrentNodeId
at CXIssueTrackingTool.mw.cx.tools.IssueTrackingTool.getCurrentPanel
at CXIssueTrackingTool.mw.cx.tools.IssueTrackingTool.init
at CXIssueTrackingTool.mw.cx.tools.IssueTrackingTool.showIssues
at mw.cx.ui.ToolsColumn.showIssues
at mw.cx.ui.TranslationView.onTranslationIssues
at MwCxTranslationController.mw.cx.TranslationController.onTranslationIssues
at MwCxDmTranslation.OO.EventEmitter.emit
at VeDmCXSectionNode.ve.dm.CXLintableNode.addTranslationIssues
at MwCXTranslationTracker.mw.cx.TranslationTracker.setMTAbuseWarning
```
== User impact ==
* Does not show the issues with the translation (MT percentage limit, page already exists, etc...)