bitbake: bitbake-layers: ensure we exit if BBLAYERS_LAYERINDEX_URL is not set

We were printing an error here, but not exiting.

(Bitbake rev: ddcaf8950a0b1cc74806e1ad7b49a1de0ea0d2b1)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-layers

@@ -265,6 +265,7 @@ Removes the specified layer from bblayers.conf
         apiurl = self.bbhandler.config_data.getVar('BBLAYERS_LAYERINDEX_URL', True)
         if not apiurl:
             logger.error("Cannot get BBLAYERS_LAYERINDEX_URL")
+            return 1
         else:
             if apiurl[-1] != '/':
                 apiurl += '/'