Work-around for occassional missing language in entity field arrays.

Getting these errors. Not sure why the language is gone from the entity fields:

Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 37 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 38 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 42 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 43 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 44 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 46 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).
Notice: Undefined index: und in c21_search_apachesolr_index_document_build() (line 47 of /home/hull/sites/c21hull.com/docroot/sites/all/modules/custom/c21_search/c21_search.module).

Added a commit to pull from field arrays without language members as a fallback.