(trigger.py) Fix: if head_commit is False/None, ignore this tree

Some trees violate pydantic scheme if they return False/None,
and break trigger service. Ignore such trees.

Signed-off-by: Denys Fedoryshchenko <[email protected]>

Author: nuclearcat

src/trigger.py

@@ -54,8 +54,11 @@ def _run_trigger(self, build_config, force, timeout, trees):
                 current_config._branch = latest['branch']
 
             head_commit = kernelci.build.get_branch_head(current_config)
+            if not head_commit:
+                self.log.error(f"Failed to get branch head for {current_config.name:32s}, ignoring")
+                return
         except Exception as ex:
-            self.log.error(f"Failed to get branch head for {current_config.name:32s}")
+            self.log.error(f"Failed to get branch head for {current_config.name:32s}, ignoring")
             self.traceback(ex)
             return
         search_terms = {