Log when we fail to get key password from secure cmd

Change-Id: I4455f43e43b772e785ece48721dcd770f0bc8711
Signed-off-by: RITEFANG <1721985272@qq.com>

tools/releasetools/common.py

@@ -2906,6 +2906,8 @@ class PasswordManager(object):
               output = ps.communicate()[0]
               if ps.returncode == 0:
                 current[i] = output.decode('utf-8')
+              else:
+                logger.warning('Failed to get password for key "%s".', i)
             except Exception as e:
               print(e)
               pass