bitbake: runqueue: Improve error message for missing multiconfig

If you place a multiconfig which isn't enabled into an mcdepends you currently
get a traceback from runqueue. We can do better, add some code to tell the user
what happened in a more readable way without the traceback.

[YOCTO #14970]

(Bitbake rev: a4693b70764bb394ee2cf8dd12a5f6fce866008b)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/runqueue.py

@@ -698,6 +698,8 @@ class RunQueueData:
                 frommc = mcdependency[1]
                 mcdep = mcdependency[2]
                 deptask = mcdependency[4]
+                if mcdep not in taskData:
+                    bb.fatal("Multiconfig '%s' is referenced in multiconfig dependency '%s' but not enabled in BBMULTICONFIG?" % (mcdep, dep))
                 if mc == frommc:
                     fn = taskData[mcdep].build_targets[pn][0]
                     newdep = '%s:%s' % (fn,deptask)