[FAB-7556] check for bad config in channel tx

Bad configs will cause channel config components to
return nil channelconfig. This can happen with
handcrafted configs using configtxlator tool.

This is really a side effect of not catching an earlier
error. Fixing the root cause.

Change-Id: I01828d8e2c1520a3c694c49587e5aca3867681d3
Signed-off-by: Srinivasan Muralidharan <srinivasan.muralidharan99@gmail.com>

core/peer/peer.go

@@ -365,6 +365,9 @@ func createChain(cid string, ledger ledger.PeerLedger, cb *common.Block) error {
 	}
 
 	rBundle, err := resourcesconfig.NewBundle(cid, resConf, bundle)
+	if err != nil {
+		return err
+	}
 
 	cs.bundleSource = resourcesconfig.NewBundleSource(
 		rBundle,