ODoE: Error handling when results are None

[sotorrio1]

Fixes/Addresses:

Addresses issue #1126

Summary/Motivation:

Although issue #1126 seems to be solved, we're proposing a different way to handle errors in the case the ODoE results (best_indices and best_optval) are None.

Changes proposed in this PR:

• check if best_indices is None and modify resultMessage accordingly
• check if best_optval is None and modify resultMessage accordingly

Legal Acknowledgement

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[codecov]

Codecov Report

Patch has no changes to coverable lines.

Files Changed	Coverage
foqus_lib/gui/sdoe/sdoeSetupFrame.py	0.00%

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[ksbeattie]

LGTM. At least this doesn't throw an exception and shows the user that something has gone wrong.