Original texts can be created with no reference

[tcouch]

When creating a new fragment, the form can be submitted with no references. The fragment is created successfully, but an error is raised when rendering the detail page because the reference_list property cannot deal with an original text having no references.

The solution would be to either:

• require all original texts to have at least one reference
• fix the reference_list property to allow for no references

[tcouch]

@rmamarshall do you think it would be preferable to allow original texts to be created without any references, or should be put controls in place to prevent that happening?

[rmamarshall]

@tcouch Every original text needs at least one reference - a block to prevent the creation of original texts without an entry in a reference field would be a good idea.