Deleting range of annotations produces error

[martinleopold]

Tested with: branch master (f40361e)

Shift-selecting a range of annotations and pressing the Delete Icon produces an error:

• Reset to sample project
• In the timeline, click on the first annotation of the first track ('MGM Title Card')
• Shift-click on the third annotation in the same track ('Credits'). This selects the first four annotations
• Click the delete button in the Toolbar.
• Annotations are not deleted
• Selection is stuck. Cannot deselect annotations or select other annotations.
• Error in console:

core.js:6237 ERROR TypeError: Cannot read property 'filter' of undefined
    at embedAnnotations (http://localhost:4200/main.js:5844:35)
    at http://localhost:4200/main.js:7676:114
    at http://localhost:4200/vendor.js:107826:54
    at http://localhost:4200/vendor.js:105880:16
    at ArrayMapNode.push../node_modules/immutable/dist/immutable.es.js.ArrayMapNode.iterate.HashCollisionNode.iterate (http://localhost:4200/vendor.js:106278:9)
    at Map.__iterate (http://localhost:4200/vendor.js:105878:18)
    at Set.__iterate (http://localhost:4200/vendor.js:107826:22)
    at Set.forEach (http://localhost:4200/vendor.js:108212:17)
    at reducer (http://localhost:4200/main.js:7673:21)
    at combination (http://localhost:4200/vendor.js:95994:37)

[martinleopold]

From: "adrian.soluch@gmail.com" adrian.soluch@gmail.com
Date: 4. August 2020 at 11:34:25 CEST

#227
altes issue, bereits vor meinen ersten änderungen vorhanden gewesen (checkout commit 23925a8 - letztes vor meinen ersten changes: dinony committed on 26 Feb 2019)

• dasselbe issue existierte dort schon

core.js:1673 ERROR TypeError: Cannot read property 'filter' of undefined
at embedAnnotations (http://localhost:4200/main.js:3280:33)
at http://localhost:4200/main.js:5169:116
at http://localhost:4200/vendor.js:71833:54
at http://localhost:4200/vendor.js:69887:16
at ArrayMapNode.push../node_modules/immutable/dist/immutable.es.js.ArrayMapNode.iterate.HashCollisionNode.iterate (http://localhost:4200/vendor.js:70285:9)
at Map.__iterate (http://localhost:4200/vendor.js:69885:18)
at Set.__iterate (http://localhost:4200/vendor.js:71833:22)
at Set.forEach (http://localhost:4200/vendor.js:72219:17)
at reducer (http://localhost:4200/main.js:5166:21)
at combination (http://localhost:4200/vendor.js:60158:35)