rootfs.py: Check for LDCONFIGDEPEND being empty string
We override LDCONFIGDEPEND to be empty string for uclibc
however the current check is for it being None as a result
the function is still executed but ldconfig-native is not
built as dependency for rootfs when building with uclibc
Fixes errors like below
File:
'/home/kraj/work/angstrom-repo/sources/openembedded-core/meta/lib/oe/rootfs.py',
lineno: 191, function: _run_ldconfig
0187: def _run_ldconfig(self):
0188: if self.d.getVar('LDCONFIGDEPEND', True) is not None:
0189: bb.note("Executing: ldconfig -r" +
self.image_rootfs + "-c new -v")
0190: self._exec_shell_cmd(['ldconfig', '-r',
self.image_rootfs, '-c',
*** 0191: 'new', '-v'])
