Diff of /upnpglobalvars.h [e3792a] .. [6e43ab]  Maximize  Restore

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--- a/upnpglobalvars.h
+++ b/upnpglobalvars.h
@@ -73,6 +73,7 @@
 #else
 #define _(string) (string)
 #endif
+#define THISORNUL(s) (s ? s : "")
 
 #ifndef PNPX
 #define PNPX 0