msubprojects: Fix crash if wrapdb_version is in bad format

Fixes: mesonbuild#12378

Author: xclaesse

mesonbuild/msubprojects.py

@@ -153,6 +153,11 @@ def update_wrapdb(self) -> bool:
         try:
             wrapdb_version = self.wrap.get('wrapdb_version')
             branch, revision = wrapdb_version.split('-', 1)
+        except ValueError:
+            if not options.force:
+                self.log('  ->', mlog.red('Malformed wrapdb_version field, use --force to update any way'))
+                return False
+            branch = revision = None
         except WrapException:
             # Fallback to parsing the patch URL to determine current version.
             # This won't work for projects that have upstream Meson support.