[sr-dev] [kamailio/kamailio] permissions: check for db_url being set on reload (#1621)

[Armen Babikyan]

This fixes a null pointer exception in a config that loads permission.so but does not set its db_url.

To repro, create a config with loadmodule "permissions.so" but NOT modparam("permissions", "db_url", "foo"), and then run "kamctl trusted reload".  Kamailio will crash without this patch.  With this patch, kamctl will return with "Reload failed" and a message will be printed in kamailio logs.

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