fix rosmake for non-empty stacks (fix #4068)

tools/rosmake/src/rosmake/engine.py

@@ -761,9 +761,10 @@ class RosMakeAll:
             
         required_packages = self.specified_packages[:]
 
-        # catch dependent packages which are inside of zero sized stacks #3528 
+        # catch packages of dependent stacks when specified stack is zero-sized #3528
         # add them to required list but not the specified list. 
         for s in stacks_arguments:
+            if not rosstack.packages_of(s):
                 for d in rosstack.get_depends(s, implicit=False):
                     try:
                         required_packages.extend(rosstack.packages_of(d))