Poet fails if there are no dependencies

[lily-mara]

If your poetry.toml file has no dependencies, you will get this error:

λ poet install -v

Locking dependencies to poetry.lock

 - Resolving dependencies (1 sec)
 - Writing dependencies


  [KeyError]
  'package'


Exception trace:
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/cleo/application.py in run() at line 95
   status_code = self.do_run(input_, output_)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/cleo/application.py in do_run() at line 188
   status_code = command.run(input_, output_)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/cleo/commands/command.py in run() at line 99
   return super(Command, self).run(i, o)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/cleo/commands/base_command.py in run() at line 146
   status_code = self.execute(input_, output_)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/console/commands/index_command.py in execute() at line 28
   super(IndexCommand, self).execute(i, o)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/console/commands/command.py in execute() at line 63
   return super(Command, self).execute(i, o)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/cleo/commands/command.py in execute() at line 108
   return self.handle()
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/console/commands/install.py in handle() at line 33
   installer.install(features=features, dev=dev)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/installer.py in install() at line 59
   return self.install(features=features, dev=dev)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/installer.py in install() at line 61
   lock = self._poet.lock
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/poet.py in lock() at line 199
   return Lock(self.lock_file)
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/poet.py in __init__() at line 58
   self.load()
 /users/nm46057/.anaconda3/envs/poet-test/lib/python3.6/site-packages/poet/lock.py in load() at line 17
   packages = self._config['package']

install [-i|--index INDEX] [-f|--features FEATURES] [--no-dev] [--no-progress]

This is because of this line packages = self._config['package'], assuming that there will be a package section of the poetry.lock file. It should be replaced with self._config.get('package', []).