Bugfix: Refine fix for handling empty configuration files

[JohnHalleyGotway]

Describe the Problem

The config.tab.cc source code was edited...
From: yystate = 0;
To: yystate = 8;
Initializing the parsing state to a value of 8 enables it to successfully parse empty configuration files without error. The default initial value of 0 produces a runtime error. PR #2291 for issue #2237 made this change and added a test for processing empty config files to unit_stat_analysis_ps.xml. That test fails sporadically in the MET Nightly Build.

The MET Nightly Build is run with MET_DEVELOPMENT = true and that triggers the ENABLE_DEVELOPMENT setting in the configuration file. When the develop branch is checked out, sometime the config.tab.yy file has a timestamp newer than the config.tab.cc file. When make is run, the triggers config.tab.cc to be regenerated from config.tab.yy. And each time it's regenerated, that initial yystate value of 8 gets reset to the default value of 0.

The proposed fix is the update Makefile.am to explicitly patch the initial yystate value immediately after its generated. It's not a very elegant fix, but should produce the desired result.

Expected Behavior

MET should be able to process empty config files without error and the NB should not fail.

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