Allow lcd_implementation_drawedit to draw a message

Marlin/dogm_lcd_implementation.h

 
   u8g.setPrintPos(0, rowHeight + kHalfChar);
   lcd_printPGM(pstr);
-  lcd_print(':');
-  u8g.setPrintPos((lcd_width - 1 - vallen) * char_width, rows * rowHeight + kHalfChar);
-  lcd_print(value);
+  if (value != NULL) {
+    lcd_print(':');
+    u8g.setPrintPos((lcd_width - 1 - vallen) * char_width, rows * rowHeight + kHalfChar);
+    lcd_print(value);
+  }
 }
 
 #if ENABLED(SDSUPPORT)

Marlin/ultralcd.cpp

         babystepsTodo[axis] += distance;
       #endif
     }
-    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, "");
+    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, NULL);
     if (LCD_CLICKED) lcd_goto_previous_menu();
   }
 
    * MBL Move to mesh starting point
    */
   static void _lcd_level_bed_homing() {
-    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ"), MSG_LEVEL_BED_HOMING);
+    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ " MSG_LEVEL_BED_HOMING), NULL);
     if (axis_known_position[X_AXIS] && axis_known_position[Y_AXIS] && axis_known_position[Z_AXIS]) {
       current_position[Z_AXIS] = MESH_HOME_SEARCH_Z;
       plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);

Marlin/ultralcd_implementation_hitachi_HD44780.h

 void lcd_implementation_drawedit(const char* pstr, const char* value) {
   lcd.setCursor(1, 1);
   lcd_printPGM(pstr);
-  lcd.print(':');
-  lcd.setCursor(LCD_WIDTH - lcd_strlen(value), 1);
-  lcd_print(value);
+  if (value != NULL) {
+    lcd.print(':');
+    lcd.setCursor(LCD_WIDTH - lcd_strlen(value), 1);
+    lcd_print(value);
+  }
 }
 
 #if ENABLED(SDSUPPORT)