Dictionary overrides not supported in _VAR<n>_OPTIONS

[georgemccabe]

Brought to our attention by @jwolff-ncar
Setting the following

OBS_VAR1_OPTIONS = interp = { type = [ { method = NEAREST; width = 1; } ] };

fails because it tries to interpret the text between curly braces (method = NEAREST; width = 1;) as a variable.

05/06 18:30:16.911 metplus.PointStat (met_util.py:186) ERROR: Fatal error occurred
Traceback (most recent call last):
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/met_util.py", line 164, in run_metplus
    all_commands = loop_over_times_and_call(config, processes)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/met_util.py", line 991, in loop_over_times_and_call
    process.run_at_time(input_dict)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/wrappers/compare_gridded_wrapper.py", line 164, in run_at_time
    self.run_at_time_once(time_info)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/wrappers/compare_gridded_wrapper.py", line 177, in run_at_time_once
    time_info)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/met_util.py", line 2460, in sub_var_list
    out_var_info = sub_var_info(var_info, time_info)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/met_util.py", line 2442, in sub_var_info
    **time_info)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/string_template_substitution.py", line 357, in do_string_sub
    skip_missing_tags)
  File "/contrib/METplus/METplus-4.0.0-beta5/metplus/util/string_template_substitution.py", line 398, in find_and_replace_tags_in_template
    " for template: " + tmpl + ": " + str(kwargs))
TypeError: The key  method = NEAREST; width = 1;  was not passed to do_string_sub  for template: GRIB_lvl_typ = 200; interp = { type = [ { method = NEAREST; width = 1; } ] };: {'now': datetime.datetime(2021, 5, 6, 18, 30, 16), 'today': '20210506', 'instance': '', 'lead': 43200, 'offset': 0, 'init': datetime.datetime(2019, 6, 15, 0, 0), 'valid': datetime.datetime(2019, 6, 15, 12, 0), 'loop_by': 'init', 'da_init': datetime.datetime(2019, 6, 15, 12, 0), 'da_init_fmt': '20190615120000', 'valid_fmt': '20190615120000', 'init_fmt': '20190615000000', 'lead_string': '12 hours', 'offset_hours': 0, 'date': datetime.datetime(2019, 6, 15, 12, 0), 'cycle': datetime.datetime(2019, 6, 15, 12, 0), 'lead_hours': 12, 'lead_minutes': 720, 'lead_seconds': 43200, 'custom': ''}
05/06 18:30:16Z run-METplus-metplus.PointStat: ERROR:  Fatal error occurred

Describe the Problem

See above

Expected Behavior

When setting:
OBS_VAR1_OPTIONS = interp = { type = [ { method = NEAREST; width = 1; } ] };

The value should be substituted as is. This can be remedied by allowing missing tags in the do_string_sub call that performs this substitution.

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[georgemccabe]

This bugfix was only applied to the develop branch because we are very close to the 4.0.0 release.