graphIO : try/except on getpass.getuser to avoid issues

Author: Alxiice

meshroom/core/graphIO.py

@@ -96,7 +96,10 @@ def serializeHeader(self) -> dict:
         header: dict[str, Any] = {}
         header[GraphIO.Keys.ReleaseVersion] = meshroom.__version__
         header[GraphIO.Keys.FileVersion] = GraphIO.__version__
-        header[GraphIO.Keys.Username] = getpass.getuser()
+        try:
+            header[GraphIO.Keys.Username] = getpass.getuser()
+        except Exception:
+            header[GraphIO.Keys.Username] = ""
         header[GraphIO.Keys.NodesVersions] = self._getNodeTypesVersions()
         if self._graph._hasExplicitCacheDir:
             # We store the absolute but also the relative cacheDir path (to the scene file)