Add error message when search for Netbeans fail.
--- a/.fvwm/config Tue Oct 20 00:28:50 2015 +0300
+++ b/.fvwm/config Tue Oct 20 10:29:39 2015 +0300
@@ -456,7 +456,7 @@
DestroyMenu MenuMyDev
AddToMenu MenuMyDev "My Dev Menu" Title
+ &Firefox%iceweasel.png% Exec exec firefox -no-remote -P devel
-+ &Netbeans%netbeans.png% Exec exec $(ls /opt/*/bin/netbeans 2>/dev/null | tail -n 1; [[ ${PIPESTATUS[0]} -gt 0 ]] && command -v netbeans)
++ &Netbeans%netbeans.png% Exec exec $(ls /opt/*/bin/netbeans 2>/dev/null | tail -n 1; [[ ${PIPESTATUS[0]} -gt 0 ]] && command -v netbeans || echo xmessage "Can't find 'Netbeans' in PATH or /opt")
+ "SQL Developer" Exec exec $(ls /opt/*/sqldeveloper.sh 2>/dev/null | tail -n 1; [[ ${PIPESTATUS[0]} -gt 0 ]] && echo xmessage "Can't find 'SQL Developer' in /opt")
+ "Squirrel" Exec exec $(ls /opt/*/squirrel-sql.sh 2>/dev/null | tail -n 1; [[ ${PIPESTATUS[0]} -gt 0 ]] && echo xmessage "Can't find 'Squirrel' in /opt")