Fix build hook to handle missing wheel data

Author: openhands-agent

build.py

@@ -3,8 +3,13 @@
 class CustomBuildHook(BuildHookInterface):
     def initialize(self, version, build_data):
         """Add agent package if not installing core-only."""
-        target = build_data['wheel']['targets'][0]
-        extras = target.get('options', {}).get('extras', [])
-        
-        if 'core' not in extras:
-            target['packages'].append('commit0.optional.agent')
+        if 'wheel' not in build_data:
+            return
+
+        for target in build_data.get('wheel', {}).get('targets', []):
+            extras = target.get('options', {}).get('extras', [])
+            packages = target.get('packages', [])
+            
+            if 'core' not in extras and 'commit0.optional.agent' not in packages:
+                packages.append('commit0.optional.agent')
+                target['packages'] = packages

commit0/commit0

@@ -0,0 +1 @@
+Subproject commit a853f8168dc8187eebbd788c8fc4a4137644f74b