Add check for 'breadcrumb' key in vars array.

This adds the check to verify 'breadcrumb' is a valid key in the $vars array that's passed to the preprocess breadcrumb hook.

Signed-off-by: David ML Brown Jr dmlb2000@gmail.com

Closes #3444698

added 1 commit

• f1e04dc4 - #3444698 Added sanity check in preprocess breadcrumbs

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