CESNET/perun — pull request #398 by zlamalp (2014-08-01 11:18:06+00:00)
Title: BEANS: fixed converting empty string to attribute value

- When converting string to attribute value convert
empty string as null, in order to keep equality between
Oracle and Postgres DB.

This will also fix case, when attributes are passed in Candidate object.

- Fixed typos in exceptions texts.