Merge pull request #254 from PavelSindler/sort_dir_fix

removing SD during sorting fixed

Firmware/cardreader.cpp

@@ -834,6 +834,7 @@ void CardReader::presort() {
 		if (fileCnt > 1) {
 			// Init sort order.
 			for (uint16_t i = 0; i < fileCnt; i++) {
+				if (!IS_SD_INSERTED) return;
 				manage_heater();
 				sort_order[i] = i;
 
@@ -909,6 +910,8 @@ void CardReader::presort() {
 			#endif
 
 			for (uint16_t i = fileCnt; --i;) {
+				if (!IS_SD_INSERTED) return;
+
 				bool didSwap = false;
 				#if !SDSORT_USES_RAM //show progresss bar only if slow sorting method is used
 				int8_t percent = (counter * 100) / total;//((counter * 100) / pow((fileCnt-1),2));
@@ -920,6 +923,7 @@ void CardReader::presort() {
 
 				//MYSERIAL.println(int(i));
 				for (uint16_t j = 0; j < i; ++j) {
+					if (!IS_SD_INSERTED) return;
 					manage_heater();
 					const uint16_t o1 = sort_order[j], o2 = sort_order[j + 1];