Fix getting multiple celltags

commander/gui/overview.py

@@ -100,9 +100,12 @@ class OverviewModel(QAbstractTableModel):
         if 'celltag' not in props:
             return None
         celltag = props['celltag']
-        if isinstance(celltag, list):  # running multiple tags
-            return celltag[0]
-        return celltag
+        return self._flatten_celltags(celltag)
+
+    def _flatten_celltags(self, tags: str | list[str]) -> str:
+        if isinstance(tags, list):
+            return tags[0]
+        return tags
 
     def _load_tag_mapping(self, reports: list[dict[str, Any]]) -> None:
         self._nodeid_to_tag = {
@@ -112,7 +115,10 @@ class OverviewModel(QAbstractTableModel):
 
         with utils.TAG_MAPPING_FILE.open('r') as f:
             from_json = json.load(f)
-        self._nodeid_to_tag.update(from_json)
+        self._nodeid_to_tag.update({
+            k: self._flatten_celltags(v)
+            for k, v in from_json.items()
+        })
 
         self.tag_mapping_loaded.emit(self._nodeid_to_tag)