rpmbuild: improve the project list management

This change removes a None value from the args.project lists.

Change-Id: I14200359ded5a959b4732828d89e41a0d6d12a36

Author: TristanCacqueray

zuul_koji_lib.py

@@ -274,5 +274,8 @@ def get_buildset_url(project, ref):
                      "local/builds?"
                      "project=" + project + "&"
                      "change=" + ref)
-    build = r.json()[0]
+    try:
+        build = r.json()[0]
+    except IndexError:
+        return None
     return build["log_url"] + "buildset/"

zuul_rpm_build.py

@@ -37,8 +37,7 @@ def usage(self):
                        default=os.environ.get('ZUUL_BRANCH', 'master'))
         p.add_argument("--pipeline",
                        default=os.environ.get('ZUUL_PIPELINE', 'check'))
-        p.add_argument("--project", action='append',
-                       default=[os.environ.get('ZUUL_PROJECT')],
+        p.add_argument("--project", action='append', default=[],
                        help="Specify project name when running outside"
                             " of Zuul context"),
         p.add_argument("--source",
@@ -323,6 +322,9 @@ def main(self, args):
                         "%s %s", project, ref)
                     # Special case for zuul ui to re-use the src.rpm:
                     buildset_url = zuul_koji_lib.get_buildset_url(project, ref)
+                    if buildset_url is None:
+                        self.log.warning("Buildset is missing")
+                        continue
                     self.log.info("Using this buildset", buildset_url)
                     srpms = zuul_koji_lib.get_srpms(buildset_url)
                     self.log.info("And this srpm %s", str(srpms))