CDK Drag and Drop: Unhandled Promise rejection in _cleanupDragArtifacts when ngbTooltip is used on cdkDrag element.

[rshanley-dig]

Reproduction

Stackblitz: https://stackblitz.com/edit/angular-wkr9so

Steps to reproduce:

1. Drag element from 'To do' to 'Done'

Expected Behavior

No exception and it gets inserted normally into the 'Done' list. It works when there is no ngbTooltip used.

Actual Behavior

Element does not get inserted in 'Done' list and Exception occurs in _cleanupDragArtifacts (because parentNode is undefined where it is expected to be defined):

Unhandled Promise rejection:
Cannot read property 'insertBefore' of null
; Zone:
<root>
; Task:
Promise.then
; Value:
Error: Cannot read property 'insertBefore' of null
TypeError: Cannot read property 'insertBefore' of null
at DragRef._cleanupDragArtifacts (https://angular-wkr9so.stackblitz.io/turbo_modules/@angular/cdk@8.2.3/bundles/cdk-drag-drop.umd.js:1032:63)
at eval (https://angular-wkr9so.stackblitz.io/turbo_modules/@angular/cdk@8.2.3/bundles/cdk-drag-drop.umd.js:861:23)
at ZoneDelegate.invoke (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:391:26)
at Zone.run (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:150:43)
at eval (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:910:34)
at ZoneDelegate.invokeTask (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:423:31)
at Zone.runTask (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:195:47)
at drainMicroTaskQueue (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:601:35)
at ZoneTask.invokeTask [as invoke] (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:502:21)
at invokeTask (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:1693:14)
at HTMLDivElement.globalZoneAwareCallback (https://angular-wkr9so.stackblitz.io/turbo_modules/zone.js@0.9.1/dist/zone.js:1719:17)

Environment

• Angular: 8.2.9
• CDK/Material: 8.2.2
• Browser(s): Chrome 79.0.3945.117
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

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