module development

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If you need a simple Views display switch to toggle e.g between a list and a grid display of a view, there are a couple of plug & play options already.

Why check if term is associated to a node prior to deletion?

In cases where taxonomy terms are used only for categorizing content on a Drupal powered web page, there should be no harm in deleting them. However sometimes taxonomy is used to store terms critical to the content they are referenced from and in this case steps should be taken to prevent an accidental deletion.