D25635.1734729143.diff
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	diff --git a/src/infrastructure/editor/PhabricatorEditorURIEngine.php b/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	--- a/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	+++ b/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	@@ -279,10 +279,11 @@
	// editor links do surprising things with paths containing "/../".

	// Find anything that looks like "/../" and mangle it.
	-
	- $token = preg_replace('((^\|/)\.\.(/\|\z))', '\1dot-dot\2', $token);
	-
	- return phutil_escape_uri($token);
	+ if (phutil_nonempty_string($token)) {
	+ $token = preg_replace('((^\|/)\.\.(/\|\z))', '\1dot-dot\2', $token);
	+ return phutil_escape_uri($token);
	+ }
	+ return '';
	}

	private function newStringFromTokens(array $tokens) {