Bad jmespath expression: Unknown character

I am unable to run `aws-shell`. After `pip install aws-shell` and `aws-shell` I get the following.

```
First run, creating autocomplete index...
Traceback (most recent call last):
File "/home/stibbons/.local/bin/aws-shell", line 10, in
sys.exit(main())
File "/home/stibbons/.local/lib/python2.7/site-packages/awsshell/__init__.py", line 47, in main
write_index(index_file)
File "/home/stibbons/.local/lib/python2.7/site-packages/awsshell/makeindex.py", line 67, in write_index
index_command(current, help_command)
File "/home/stibbons/.local/lib/python2.7/site-packages/awsshell/makeindex.py", line 59, in index_command
index_command(child, sub_help_command)
File "/home/stibbons/.local/lib/python2.7/site-packages/awsshell/makeindex.py", line 58, in index_command
sub_help_command = sub_command.create_help_command()
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/waiters.py", line 81, in create_help_command
command_table=self.subcommand_table,
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/commands.py", line 278, in subcommand_table
self._subcommand_table = self._build_subcommand_table()
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/waiters.py", line 75, in _build_subcommand_table
self.waiter_cmd_builder.build_all_waiter_state_cmds(subcommand_table)
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/waiters.py", line 102, in build_all_waiter_state_cmds
self._build_waiter_state_cmd(waiter_name)
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/waiters.py", line 130, in _build_waiter_state_cmd
description = waiter_state_doc_builder.build_waiter_state_description()
File "/home/stibbons/.local/lib/python2.7/site-packages/awscli/customizations/waiters.py", line 156, in build_waiter_state_description
for acceptor in self._waiter_config.acceptors:
File "/home/stibbons/.local/lib/python2.7/site-packages/botocore/waiter.py", line 153, in acceptors
acceptor = AcceptorConfig(acceptor_config)
File "/home/stibbons/.local/lib/python2.7/site-packages/botocore/waiter.py", line 164, in __init__
self.matcher_func = self._create_matcher_func()
File "/home/stibbons/.local/lib/python2.7/site-packages/botocore/waiter.py", line 176, in _create_matcher_func
return self._create_path_matcher()
File "/home/stibbons/.local/lib/python2.7/site-packages/botocore/waiter.py", line 190, in _create_path_matcher
expression = jmespath.compile(self.argument)
File "/home/stibbons/.local/lib/python2.7/site-packages/jmespath/__init__.py", line 7, in compile
return parser.Parser().parse(expression)
File "/home/stibbons/.local/lib/python2.7/site-packages/jmespath/parser.py", line 81, in parse
parsed_result = self._do_parse(expression)
File "/home/stibbons/.local/lib/python2.7/site-packages/jmespath/parser.py", line 89, in _do_parse
return self._parse(expression)
File "/home/stibbons/.local/lib/python2.7/site-packages/jmespath/parser.py", line 102, in _parse
self._tokens = list(self.tokenizer)
File "/home/stibbons/.local/lib/python2.7/site-packages/jmespath/lexer.py", line 67, in tokenize
expression=expression)
jmespath.exceptions.LexerError: Bad jmespath expression: Unknown character:
length(services[?!(length(deployments) == `1` && runningCount == desiredCount)]) == `0`
```

Reproduce the failure by launching aws-shell after installation, then trace the index-building path through awsshell/makeindex.py and the waiter handling in awscli/customizations/waiters.py and botocore/waiter.py. Inspect the reported JMESPath expression and dependency behavior first; done means the initial autocomplete index is created without the LexerError.

Written by the indexing model from the issue text.