Sanity check for a real probe with M48

Marlin/SanityCheck.h

@@ -599,12 +599,14 @@ static_assert(1 >= 0
     #else
       #error "Auto Bed Leveling requires one of these: PROBE_MANUALLY, FIX_MOUNTED_PROBE, BLTOUCH, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or a Z Servo."
     #endif
-  #elif ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST)
-    #error "Z_MIN_PROBE_REPEATABILITY_TEST requires a probe: FIX_MOUNTED_PROBE, BLTOUCH, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."
   #endif
 
 #endif
 
+#if ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST) && !HAS_BED_PROBE
+  #error "Z_MIN_PROBE_REPEATABILITY_TEST requires a probe: FIX_MOUNTED_PROBE, BLTOUCH, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."
+#endif
+
 /**
  * Allow only one bed leveling option to be defined
  */