Fix to trigger creation in database deletions

inabox.database.sqlite/SQLiteProvider.cs

@@ -629,8 +629,14 @@ namespace InABox.Database.SQLite
                 cascadeFields.Sort();
                 setNullFields.Sort();
 
-                cascades.Add(new(otherType, cascadeFields));
-                setNulls.Add(new(otherType, setNullFields));
+                if(cascadeFields.Count > 0)
+                {
+                    cascades.Add(new(otherType, cascadeFields));
+                }
+                if(setNulls.Count > 0)
+                {
+                    setNulls.Add(new(otherType, setNullFields));
+                }
             }
 
             if(cascades.Count > 0)