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filter_engine.py

@@ -134,8 +134,10 @@ def _(EXAMPLE_DATASETS, mo):
         options=["Load example", "Upload your own"],
         value="Load example",
     )
+    _datasets = list(EXAMPLE_DATASETS.keys())
     example_picker = mo.ui.dropdown(
-        options=list(EXAMPLE_DATASETS.keys()),
+        options=_datasets,
+        value=_datasets[0] if _datasets else None,
         label="Example dataset",
     )
     sample_file = mo.ui.file(kind="area", filetypes=[".csv"])
@@ -241,11 +243,12 @@ def _(df_selected, initial_date_column, initial_yaml, mo):
 
 
 @app.cell
-def _(df_selected, load_profile, mo, yaml, yaml_editor):
-    mo.stop(yaml_editor.value is None)
+def _(df_selected, initial_yaml, load_profile, mo, yaml, yaml_editor):
+    _yaml_to_use = yaml_editor.value if yaml_editor.value is not None else initial_yaml
+    mo.stop(_yaml_to_use is None)
 
     try:
-        _parsed = yaml.safe_load(yaml_editor.value)
+        _parsed = yaml.safe_load(_yaml_to_use)
     except yaml.YAMLError as _e:
         mo.stop(True, mo.callout(mo.md(f"**Invalid YAML:** {_e}"), kind="danger"))
 
@@ -309,7 +312,8 @@ def _(mo):
 
 
 @app.cell
-def _(df_selected):
+def _(df_selected, mo):
+    mo.stop(df_selected is None)
     df_selected.sample(10)
     return