[Fix] Remove all Scenarios, catch empty SMILES, prevent default Package delete (#134)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#134

templates/errors/error.html

@@ -6,8 +6,7 @@
         <h4 class="alert-heading">{{ error_message }}</h4>
         <hr>
         <p class="mb-0">
-            {{ error_detail }}<br>
-            The error was logged and will be investigated.
+            {{ error_detail }}
         </p>
     </div>