Don't require presence of qgisprojects db service

src/plugins/themes/utils/themes.py

@@ -245,17 +245,20 @@ def get_projects(app, handler):
         db = db_engine.db_engine(db_url)
         db_projects = []
         sql = sql_text("SELECT schema_name FROM information_schema.schemata")
-        with db.begin() as connection:
-            schema_rows = connection.execute(sql).mappings()
-        for schema_row in schema_rows:
-            try:
-                sql = sql_text('SELECT name FROM "{schema}"."qgis_projects"'.format(schema=schema_row["schema_name"]))
-                with db.begin() as connection:
-                    db_project_rows = connection.execute(sql).mappings()
-                for db_project_row in db_project_rows:
-                    db_projects.append({"name": db_project_row["name"], "schema": schema_row["schema_name"]})
-            except Exception as e:
-                pass
+        try:
+            with db.begin() as connection:
+                schema_rows = connection.execute(sql).mappings()
+            for schema_row in schema_rows:
+                try:
+                    sql = sql_text('SELECT name FROM "{schema}"."qgis_projects"'.format(schema=schema_row["schema_name"]))
+                    with db.begin() as connection:
+                        db_project_rows = connection.execute(sql).mappings()
+                    for db_project_row in db_project_rows:
+                        db_projects.append({"name": db_project_row["name"], "schema": schema_row["schema_name"]})
+                except Exception as e:
+                    pass
+        except Exception as e:
+            pass
 
         for project in db_projects:
             url = ows_prefix.rstrip("/") + "/pg/" + project["schema"] + "/" + project["name"]