Issue #3376025: Deleting null aliases on bulk generation.

Aryan Singhrequested to merge
issue/pathauto-3376025:3376025-deleting-empty-aliases into 8.x-1.x

I have added the method call of deleteEmptyAlias() in two other places:

  1. save() method of AliasStorageHelper, so that empty/null aliases gets deleted when a existing alias is created or new alias is generated.
  2. PathautoGenerator so that empty/null aliases gets deleted on bulk generate.

Closes #3376025

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