Fix crash in MIMEScanner::append with std::string.#5605

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SolidWallOfCode merged 1 commit intoapache:masterfrom

SolidWallOfCode:http2-mime-hdr-crash-fix

Jun 7, 2019

Commits on Jun 6, 2019

Fix crash in MIMEScanner::append with std::string. See #5587.
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