Undefined variable $rcontexts in ctools_context_get_context_from_relationships()

Thanks @darkodev, there are possible paths where the variable is not initialized, seems safe enough to commit

@darkodev please take a look at 🐛 Incorrect context passed to ctools_context_get_context_from_relationship() Needs review as it has a similar change and another change, needs a review considering I committed this

@joelpittet My fix addresses the primary issue in https://www.drupal.org/project/ctools/issues/3216839: →
"[...] if the relationship's context is not present, then the context passed to the relationship is whatever the variable $rcontexts was last set to in the previous loops."
"The quick fix for passing the wrong context would be to ensure $rcontext is unset/reset on each loop."

Setting $rcontexts to array() or NULL does not seem to change the behaviour of ctools_context_get_context_from_relationship(), but setting it to NULL would align it with the other issue.

Perhaps the secondary issue in https://www.drupal.org/project/ctools/issues/3216839 🐛 Incorrect context passed to ctools_context_get_context_from_relationship() Needs review about contexts qualifies as a separate issue, as it is specific to views_panes.inc?

Automatically closed - issue fixed for 2 weeks with no activity.