If constancia is not found, it should show "Not Valid"

[ebarojas]

When clicking to validate an Rx where the constancia is not known, it shows a made up Notarised timestamp and links to a non-existant NOM 151 constancia.

![telegram-cloud-photo-size-1-5170597444621281587-y](https://user-images.githubusercontent.com/8750702/114794422-13cccc80-9d52-11eb-9c93-
35d42d63ac4a.jpg)