[LyX/master] Properly report back if showDirectory() doesn't succeed

[Juergen Spitzmueller]

commit d44929ff813fcdc9c44e49491376cace21630234
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Thu Aug 27 11:58:37 2020 +0200

    Properly report back if showDirectory() doesn't succeed
---
 src/frontends/qt/qt_helpers.cpp |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/frontends/qt/qt_helpers.cpp b/src/frontends/qt/qt_helpers.cpp
index 20f5803..87b6593 100644
--- a/src/frontends/qt/qt_helpers.cpp
+++ b/src/frontends/qt/qt_helpers.cpp
@@ -290,12 +290,16 @@ void showDirectory(FileName const & directory)
 	QUrl qurl(QUrl::fromLocalFile(QDir::toNativeSeparators(toqstr(directory.absFileName()))));
 	// Give hints in case of bugs
 	if (!qurl.isValid()) {
-		LYXERR0("QUrl is invalid!");
+		frontend::Alert::error(_("Invalid URL"),
+			bformat(_("The URL `%1$s' could not be resolved."),
+				qstring_to_ucs4(qurl.url())));
 		return;
 
 	}
 	if (!QDesktopServices::openUrl(qurl))
-		LYXERR0("Unable to open QUrl even though dir exists!");
+		frontend::Alert::error(_("URL could not be accessed"),
+			bformat(_("The URL `%1$s' could not be opened although it exists!"),
+				qstring_to_ucs4(qurl.url())));
 }
 
 void showTarget(string const & target, string const & pdfv, string const & psv)