package_manager.py: correctly handle empty opkg-query-helper.py output

If the output from opkg-query-helper.py is empty, output.split('\n')
would result in a list containing one element which is an empty string
while iterating over each line in the output. An exception is then
thrown by the line:

    pkg, pkg_file, pkg_arch = line.split()

with the message:

    Exception: ValueError: need more than 0 values to unpack

To avoid this, we add a condition to only split the output if it isn't
empty.

Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions