bitbake-dev: Use the default task if 'None' asked for

Since the default task is not known/available until the configuration files
are parsed we may return None when the UI requests getCmdLine. We can enforce
the use of the default by querying it again after the configuration is
parsed/cache updated.

bitbake-dev/lib/bb/cooker.py

@@ -305,6 +305,10 @@ class BBCooker:
         # Need files parsed
         self.updateCache()
 
+        # If we are told to do the None task then query the default task
+        if (task == None):
+            task = self.configuration.cmd
+
         pkgs_to_build = self.checkPackages(pkgs_to_build)
 
         localdata = data.createCopy(self.configuration.data)
@@ -610,6 +614,14 @@ class BBCooker:
         Build the file matching regexp buildfile
         """
 
+        # Parse the configuration here. We need to do it explicitly here since
+        # buildFile() doesn't use the cache
+        self.parseConfiguration()
+
+        # If we are told to do the None task then query the default task
+        if (task == None):
+            task = self.configuration.cmd
+
         fn = self.matchFile(buildfile)
         self.buildSetVars()
 
@@ -680,6 +692,10 @@ class BBCooker:
         # Need files parsed
         self.updateCache()
 
+        # If we are told to do the NULL task then query the default task
+        if (task == None):
+            task = self.configuration.cmd
+
         targets = self.checkPackages(targets)
 
         def buildTargetsIdle(server, rq, abort):