Corrects a typo in the get request url when a nanomaterial entity is on side B of a chemical association.

Bug fixes for issues 75 (missing asterisk for a required sample field) and 525 (form field input trimming and issues creating chemical associations)

Fixes an issue with deleting samples that don't have a composition.

• Fixed sample deletion issue (linked to finding files with tags applied)
• Fixed "other" characterization edit issue (caused when the characterization name contained certain keywords, e.g. enzyme)
• Publication download links now work for users who aren't logged in

Merged from prod-law