Update app.py

app.py

@@ -149,6 +149,9 @@ def inject_admin_counts():
         plant_count=plant_count
     )
 
+def none_if_empty(val):
+    return val if val not in (None, '', 'None') else None
+
 # Routes
 @app.route('/')
 def home():
@@ -528,13 +531,13 @@ def new_plant():
             plant = Plant(
                 name=name,
                 picture=picture_filename,
-                climate_id=climate_id,
-                environment_id=environment_id,
-                light_id=light_id,
-                toxicity_id=toxicity_id,
-                size_id=size_id,
-                care_difficulty_id=care_difficulty_id,
-                growth_rate_id=growth_rate_id,
+                climate_id=none_if_empty(climate_id),
+                environment_id=none_if_empty(environment_id),
+                light_id=none_if_empty(light_id),
+                toxicity_id=none_if_empty(toxicity_id),
+                size_id=none_if_empty(size_id),
+                care_difficulty_id=none_if_empty(care_difficulty_id),
+                growth_rate_id=none_if_empty(growth_rate_id),
                 products=','.join(product_ids),
                 description=description,
                 care_guide=care_guide