[gnome-ostree] autobuilder: Add an assertion

[Colin Walters <walters src gnome org>]

commit 9daac7e508444eaa6a5cd615894dd63bb7ab41aa
Author: Colin Walters <walters verbum org>
Date:   Sun Nov 4 14:12:16 2012 -0500

    autobuilder: Add an assertion
    
    To help me track down a bug.

 src/ostbuild/pyostbuild/builtin_autobuilder.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/ostbuild/pyostbuild/builtin_autobuilder.py b/src/ostbuild/pyostbuild/builtin_autobuilder.py
index b394d06..217ad68 100755
--- a/src/ostbuild/pyostbuild/builtin_autobuilder.py
+++ b/src/ostbuild/pyostbuild/builtin_autobuilder.py
@@ -77,6 +77,7 @@ class OstbuildAutobuilder(builtins.Builtin):
                                                      db.load_from_path(prev_snapshot_path))
 
     def _on_resolve_exited(self, pid, status):
+        assert self.resolve_proc is not None
         self.resolve_proc = None
         success = self._status_is_success(status)
         self._resolve_taskset.finish(success)