gplazma2-grid: invalid IGTF policy file should fail with ParserException

[kofemann]

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Motivation: If a IGTF policy file has empty 'requires' field, then gplazma fails with IllegalArgumentException.

Modification: make sure, that empty 'requires' are accepted, but such IGTFInfo entries are ignored.

Result: files with invalid/unexpected policies are ignored.

Fixes: #6778 Acked-by: Paul Millar Acked-by: Dmitry Litvintsev Target: master Require-book: no Require-notes: yes (cherry picked from commit a5369100b61e7fc3d34b1048cf00918f9b1ffe2f) Signed-off-by: Tigran Mkrtchyan [email protected]