Whitespace-only validation of snippet fields
The fields "title", "description" and "code" of a the snippet model are required, yet allow the user to enter whitespace-only content. This leads to some issues esp. with the title field, which is used as link text in snippet listings. This change first adds additional validation to these fields by checking for content that contains only whitespaces. For snippets affected by this already in the database the listing now checks for empty strings and renders them as "Untitled". Additionally the snippet listing in the admin now includes the snippet's ID as link-element.
…e user account's `name`.
…he spell to work.
This reverts commit c64d531.
This reverts commit 3683634.
…o projects (besides requirements.txt) and is needed for running collectstatic automatically.
This reverts commit ef39ba4.