mv_machine_learning: bug fix to recognition request
[Versin] : 0.23.11
[Issue type] : bug fix
Fixed a bug that it didn't handle an error case correctly
at recognition request without label file.
Without label file, recognition request incurred seg. fault issue so
this patch handles the error case correctly.
In addition, this patch adds a test case which tests a recognition request
without label file.
Change-Id: I9e577e4fe8e13f3865bfc2db4a60244626d31467
Signed-off-by: Inki Dae <inki.dae@samsung.com>