fix warning when not really starting netradiant

When doing netradiant --help, you would see:
GLib-CRITICAL **: 19:22:11.618: g_string_free: assertion 'string != NULL'
failed -- twice. This fixes it.

diff --git a/radiant/preferences.h b/radiant/preferences.h
index 8c657fe7251fd80605ad5dd818227a235b5dffe5..a7739d4dce474fa6bdae9165e85422097c68d153 100644 (file)
--- a/radiant/preferences.h
+++ b/radiant/preferences.h
@@ -357,9 +357,13 @@ public:
 
 ui::Widget m_notebook{ui::null};
 
-virtual ~PrefsDlg(){
-       g_string_free( m_rc_path, true );
-       g_string_free( m_inipath, true );
+virtual ~PrefsDlg() {
+       if (m_rc_path) {
+               g_string_free( m_rc_path, true );
+       }
+       if (m_inipath) {
+               g_string_free( m_inipath, true );
+       }
 }
 
 /*!