fixup! roomservice: Skip setting revision if it's the same as default

If the project remote starts with "aosp-", the revision already gets
removed, causing a KeyError.

Change-Id: Ie016f55d55f4cf64e66de529db9caca1de9b2e82

build/tools/roomservice.py

@@ -188,7 +188,7 @@ def add_to_manifest(repositories):
                 project.attrib["remote"] = repo_remote
                 project.attrib["clone-depth"] = "1"
                 del project.attrib["revision"]
-        if project.attrib["revision"] == get_default_revision():
+        if project.attrib.get("revision", None) == get_default_revision():
             del project.attrib["revision"]
         print("Adding dependency: %s -> %s" % (project.attrib["name"], project.attrib["path"]))
         lm.append(project)