[flang] Merge pull request flang-compiler/f18#859 from flang-compiler/pmk-empty
authorPeter Klausler <35819229+klausler@users.noreply.github.com>
Fri, 6 Dec 2019 21:56:08 +0000 (13:56 -0800)
committerGitHub <noreply@github.com>
Fri, 6 Dec 2019 21:56:08 +0000 (13:56 -0800)
Accept source files with no program units (flang-compiler/f18#658)

Original-commit: flang-compiler/f18@2ebb75529c80a21658250dafffbf49ebdc27847e
Reviewed-on: https://github.com/flang-compiler/f18/pull/859


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