Do not crash when trying to reverse an empty playlist

Fixes https://github.com/ncmpcpp/ncmpcpp/issues/616.

CHANGELOG.md

@@ -1,6 +1,7 @@
 # ncmpcpp-0.10.1 (2024-??-??)
 * Fix compilation with `libc++`.
 * Remove `autogen.sh` in favour of `autoreconf`.
+* Do not crash when trying to reverse an empty playlist.
 
 # ncmpcpp-0.10 (2024-09-03)
 * Add the configuration option `mpd_password`.

src/actions.cpp

@@ -1998,7 +1998,10 @@ bool ReversePlaylist::canBeRun()
 		return false;
 	m_begin = myPlaylist->main().begin();
 	m_end = myPlaylist->main().end();
-	return findSelectedRangeAndPrintInfoIfNot(m_begin, m_end);
+	if (m_begin == m_end)
+		return false;
+	else
+		return findSelectedRangeAndPrintInfoIfNot(m_begin, m_end);
 }
 
 void ReversePlaylist::run()