fix: GUI when no data was imported

- Fix error resulting when no data is imported and `viewer` is triggered first

bin/read.py

@@ -12,7 +12,7 @@
 @click.option('--template', required=True,
               help='template file to parse data with')
 @click.option('--metadata', required=True,
-              help='configuration file to annotate data with')
+              help='metadata file to annotate data with')
 @click.option('--var', required=False, default="",
               help='Extra variables for URI generation')
 @click.option('--drop', required=False, default='no',
@@ -35,11 +35,5 @@ def cli(input_file, template, metadata, var, drop):
             resolver.store_timeseries()
 
 
-def run():
-    app.jinja_env.auto_reload = True
-    app.config['TEMPLATES_AUTO_RELOAD'] = True
-    app.run(host=SERVER['host'], port=SERVER['port'], debug=SERVER['debug'])
-
-
 if __name__ == '__main__':
     cli()

bin/viewer.py

@@ -1,5 +1,9 @@
+from edam.reader.models.database import recreate_database
+
 from edam import SERVER
 from edam.viewer.app.views import app
+from edam import database_url
+import os
 
 
 def run():
@@ -8,5 +12,12 @@ def run():
     app.run(host=SERVER['host'], port=SERVER['port'], debug=SERVER['debug'])
 
 
+def verify_database():
+    if database_url.drivername == 'sqlite':
+        if not os.path.isfile(database_url.database):
+            recreate_database()
+
+
 if __name__ == "__main__":
+    verify_database()
     run()

edam/viewer/app/views.py

@@ -155,7 +155,11 @@ def about():
 @app.route('/graphs')
 def graphs():
     all_stations = stations()  # type: [Station]
-    metrics = all_stations[0].observable_ids
+    try:
+        metrics = all_stations[0].observable_ids
+    except IndexError:
+        logger.exception("Exception:")
+        metrics = []
     return render_template('graphs.html', stations=all_stations,
                            metrics=metrics)
 

requirements-dev.txt

@@ -1,5 +1,5 @@
 pytest==7.1.2
-coverage==6.3.2
+coverage==6.4
 pytest-bdd==5.0.0
-pylint==2.13.8
+pylint==2.13.9
 vcrpy==4.1.1