Data Explorer: A single filter (unset) for a code variable code makes the DE query fail

[isangil]

Data Explorer: A single filter (unset) for a code variable code makes the DE query fail

Error is
Notice: Undefined index: filters in deims_data_explorer_form() (line 99 of /profiles/deims/modules/custom/deims_data_explorer/deims_data_explorer.pages.inc).
Warning: array_intersect_key(): Argument #1 is not an array in deims_data_explorer_form() (line 99 of /profiles/deims/modules/custom/deims_data_explorer/deims_data_explorer.pages.inc).
Recoverable fatal error: Argument 3 passed to deims_data_explorer_get_query_from_data_source() must be an array, null given, called in //profiles/deims/modules/custom/deims_data_explorer/deims_data_explorer.pages.inc on line 106 and defined in deims_data_explorer_get_query_from_data_source() (line 264 of //profiles/deims/modules/custom/deims_data_explorer/deims_data_explorer.module).

if filter is set then works.