opencv: Allow empty opencv-java package
opencv: Allow empty opencv-java package

The opencv recipe creates the opencv-java package unconditionally, but the
opencv-java package contents are generated only when the oracle-java
PACKAGECONFIG is enabled.

If oracle-java is disabled, an empty opencv-java package must be allowed so
that the dependency is satisfied.

Signed-off-by: Antony Vance <e3c1cf8c7ebedb024ba7125904c0de592e6fdff9@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt