Bug 3969: Budget search in acquisition does't work (search)

Bug 3969: Budget search in acquisition does't work (search)

Search term was never evaluated.
Patch makes sure input param is correctly stored in the variable
and changes comparison to be case insensitive.

To test:
- Check search for fund codes (case insensitive) works
- Check search for fund code in combination with library works

The budgets to be shown can depend on your permissions.
Testing with with a superlibrarian should bring up all funds.

Also fixes warns in the logs that appeared when viewing the funds
for a budget without funds.

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Funds are now searchable.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>