properly bound the catch for TypeError to stop hiding bugs

Author: agrif

buildbot/master/master.cfg

@@ -329,8 +329,6 @@ def builder(**configExtra):
         def runstep(step):
             try:
                 steps = iter(step)
-                for step in steps:
-                    runstep(step)
             except TypeError:
                 info = step._factory
                 stepkwargs = dict(
@@ -339,6 +337,9 @@ def builder(**configExtra):
                 stepkwargs.update(info.kwargs)
                 step = info.factory(*info.args, **stepkwargs)
                 factory.addStep(step)
+                return
+            for step in steps:
+                runstep(step)
 
         runstep(f())