Deltachat-desktop: Show explaination if there are no contact requests

[gerryfrancis]

• Platform (linux/mac/windows):
  Windows 8.1 Pro.

• Delta Chat Desktop Version:
  1.3.3.

• Expected behavior:
  It should not be possible to select "Contact requests" from the global three-dot menu when no contact request exists.

• Actual behavior:
  It is possible to select "Contact requests" from the global three-dot menu when no contact request exists.

• Step to reproduce the problem:
  -- Click the global three-dot menu when no contact request exists. (The menu item should be disabled.) (I have highlighted the element with a red frame.)

• Screenshot:
  

[gerryfrancis]

This issue could be seen as an enhancement, but for now it is not good to see an empty list and a text as follows:

I believe that the average user cannot understand the current behavior.

[Jikstra]

Hmm i think it would be enough to show those grey elements in the messagelist with a text around "You don't have any contact requests yet". Hiding a menu item can also be quite confusing, especially when one searches for it because the Faq for example says "Go to Menu -> Contact requests to see.."

[r10s]

i agree with @Jikstra, i would not hide or disable it, for the same reasons

but instead, some more explaining would be useful. in fact, we have a string for that, on ios as well as on android we're using chat_no_contact_requests (in case show_emails!=ALL - otherwise, just use chat_no_messages as it is now):

[gerryfrancis]

@Jikstra and @r10s I am with you, that is a good approach, thanks a lot! :+1: