FIX: parse json metadata outside of SQL engine

.gitignore

@@ -24,6 +24,9 @@ target/
 .DS_Store
 *~
 
+#alembic
+alembic.ini
+
 #vim
 *.swp
 *.swo

tiled/catalog/migrations/versions/562203c724c7_change_path_to_dataset_in_hdf5_assets.py

@@ -27,13 +27,10 @@ def upgrade():
     )
 
     # Loop over all nodes that have 'parameters' field, choose and update those related to hdf5 files
-    condition = sa.text("CAST(nodes.metadata->>'parameters' AS TEXT) != ''")
-    cursor = connection.execute(
-        sa.select(nodes.c.id, nodes.c.metadata).filter(condition).select_from(nodes)
-    )
+    cursor = connection.execute(sa.select(nodes.c.id, nodes.c.metadata).select_from(nodes))
     for _id, _md in cursor:
         if "hdf5" in (_md.get("mimetype", "") + _md.get("spec", "")).lower():
-            if isinstance(_md["parameters"], dict) and (
+            if isinstance(_md.get("parameters"), dict) and (
                 "path" in _md["parameters"].keys()
             ):
                 _md["parameters"]["dataset"] = _md["parameters"].pop("path")