Bug: az webapp new stopped working for Node.js projects

[anthonychu]

Extension name (the extension in question)

webapp

Description of issue (in as much detail as possible)

Looks like the new support for .NET may have caused Node.js projects to no longer work. Repro:

bash-4.3# git clone https://github.com/scotch-io/node-todo.git
Cloning into 'node-todo'...
remote: Counting objects: 464, done.
remote: Total 464 (delta 0), reused 0 (delta 0), pack-reused 464
Receiving objects: 100% (464/464), 61.07 KiB | 0 bytes/s, done.
Resolving deltas: 100% (163/163), done.
Checking connectivity... done.
bash-4.3# cd node-todo/
bash-4.3# ls
README.md     README_es.md  app           config        license       package.json  public        server.js
bash-4.3# az webapp new -n test-node-todo
list index out of range
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/knack/cli.py", line 194, in invoke
    cmd_result = self.invocation.execute(args)
  File "/usr/local/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 331, in execute
    six.reraise(*sys.exc_info())
  File "/usr/local/lib/python3.6/site-packages/six.py", line 693, in reraise
    raise value
  File "/usr/local/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 304, in execute
    result = cmd(params)
  File "/usr/local/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 168, in __call__
    return super(AzCliCommand, self).__call__(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/knack/commands.py", line 109, in __call__
    return self.handler(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/azure/cli/core/__init__.py", line 348, in default_command_handler
    result = op(**command_args)
  File "/root/.azure/cliextensions/webapp/azext_webapp/custom.py", line 50, in create_deploy_webapp
    lang_details = get_lang_from_content(src_dir)
  File "/root/.azure/cliextensions/webapp/azext_webapp/create_util.py", line 113, in get_lang_from_content
    package_netcore_file = os.path.join(src_path, glob.glob("*.csproj")[0])
IndexError: list index out of range
bash-4.3# 

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