Log warning when a pricing region isn't found in the region map

[kddejong]

Issue #, if available: autogenerated maintenance failing with:

2021-03-18 22:35:21,875 - cfnlint - INFO - Get ElasticMapReduce pricing
Traceback (most recent call last):
  File "/home/runner/work/cfn-python-lint/cfn-python-lint/scripts/update_specs_from_pricing.py", line 242, in <module>
    main()
  File "/home/runner/work/cfn-python-lint/cfn-python-lint/scripts/update_specs_from_pricing.py", line 228, in main
    outputs = update_outputs('EMRInstanceType', get_results('ElasticMapReduce', ['Elastic Map Reduce Instance']), outputs)
  File "/home/runner/work/cfn-python-lint/cfn-python-lint/scripts/update_specs_from_pricing.py", line 203, in get_results
    if not results.get(region_map[product.get('attributes').get('location')]):
KeyError: 'China'

Description of changes:

• Log a warning when a region isn't in the region map

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