TypeError when clearing per-node settings cache [#3635601]

When reverting the defaults for a node, content_access_delete_per_node_settings() calls content_access_per_node_setting(NULL, $node) to clear the cache.

But this causes following TypeError:

TypeError: content_access_get_settings(): Argument #1 ($setting) must be of type string, null given, called in modules/contrib/content_access/content_access.module on line 559 in content_access_get_settings() (line 262 of modules/contrib/content_access/content_access.module).

Issue fork content_access-3635601

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3635601-typeerror-contentaccessgetsettings changes, plain diff MR !37
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