Dummy Thermistor Table for testing purposes

Am I the only one who always need to change the thermistortable.h to add
a dummy table??
Ok, it is done. Just set the thermistor to 999 and it will always read
25C. Great for Testing or Development purposes.

Marlin/Configuration.h

 // 1010 is Pt1000 with 1k pullup (non standard)
 // 147 is Pt100 with 4k7 pullup
 // 110 is Pt100 with 1k pullup (non standard)
+// 999 is a Dummy Table. It will ALWAYS read 25C.. Use it for Testing or Development purposes. NEVER for production machine.
 
 #define TEMP_SENSOR_0 -1
 #define TEMP_SENSOR_1 -1

Marlin/thermistortables.h

 };
 #endif
 
+#if (THERMISTORHEATER_0 == 999) || (THERMISTORHEATER_1 == 999) || (THERMISTORHEATER_2 == 999) || (THERMISTORHEATER_3 == 999) || (THERMISTORBED == 999) //User defined table
+// Dummy Thermistor table.. It will ALWAYS read 25C.
+const short temptable_999[][2] PROGMEM = {
+   {1*OVERSAMPLENR, 25},
+   {1023*OVERSAMPLENR, 25}
+};
+#endif
+
+
+
 #define _TT_NAME(_N) temptable_ ## _N
 #define TT_NAME(_N) _TT_NAME(_N)