Fix ugly error when KeyNotFound in password group

development.md

@@ -26,6 +26,7 @@ git status
 
 # Check Version
 cat yktotp/tool.py | grep VERSION
+cat setup.cfg | grep version
 
 # Build egg locally
 python3 setup.py sdist bdist_wheel
@@ -38,7 +39,7 @@ git tag x.y.z
 git push --tags
 
 # Update to next version
-vim yktotp/tool.py
+vim yktotp/tool.py setup.cfg
 git commit -m "Prepare for next version" yktotp/tool.py
 git push
 

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = yk-totp
-# version = see setup.py
+version = 0.1.6
 
 description = A CLI tool to generate TOTP values from a password protected YubiKey by storing the password in the system-protected keyring.
 # long_description = see setup.py

setup.py

@@ -1,10 +1,8 @@
-from yktotp.tool import TOOL_VERSION
 from setuptools import setup
 
 with open('README.md', 'r', encoding='utf-8') as fh:
   long_description = fh.read()
 
 setup(
-  version=TOOL_VERSION,
   long_description=long_description,
 )

yktotp/password.py

@@ -4,7 +4,7 @@
 from click import echo
 from click.exceptions import Abort
 
-from .error import WrongPasswordError
+from .error import WrongPasswordError, KeyNotFound
 from .tool import TOOL_NAME
 from .lib import getDevice, getController, validate
 
@@ -19,7 +19,11 @@ def password_group(ctx, device_serial):
   password repeatedly.
   """
   ctx.ensure_object(dict)
-  ctx.obj['device'] = getDevice(device_serial)
+  try:
+    ctx.obj['device'] = getDevice(device_serial)
+  except KeyNotFound:
+    echo("The YubiKey '%s' is not connected right now." % device_serial)
+    exit(1)
 
 
 @password_group.command()