Report "no filesystem" on OTA uploads w/o a FS (#785)

Give a meaningful error when OTA is attempted against a chip which does
not have a filesystem configured.

Author: earlephilhower

libraries/ArduinoOTA/src/ArduinoOTA.cpp

@@ -243,6 +243,19 @@ void ArduinoOTAClass::_onRx() {
 void ArduinoOTAClass::_runUpdate() {
     IPAddress ota_ip = _ota_ip;
 
+    if (!LittleFS.begin()) {
+#ifdef OTA_DEBUG
+        OTA_DEBUG.println("LittleFS Begin Error");
+#endif
+        _udp_ota->append("ERR: ", 5);
+        _udp_ota->append("no filesystem", 13);
+        _udp_ota->send(ota_ip, _ota_udp_port);
+        delay(100);
+        _udp_ota->listen(IP_ADDR_ANY, _port);
+        _state = OTA_IDLE;
+        return;
+    }
+
     if (!Update.begin(_size, _cmd)) {
 #ifdef OTA_DEBUG
         OTA_DEBUG.println("Update Begin Error");
@@ -261,15 +274,6 @@ void ArduinoOTAClass::_runUpdate() {
         _state = OTA_IDLE;
         return;
     }
-    if (!LittleFS.begin()) {
-        _udp_ota->append("ERR: ", 5);
-        _udp_ota->append("nofilesystem", 6);
-        _udp_ota->send(ota_ip, _ota_udp_port);
-        delay(100);
-        _udp_ota->listen(IP_ADDR_ANY, _port);
-        _state = OTA_IDLE;
-        return;
-    }
 
     _udp_ota->append("OK", 2);
     _udp_ota->send(ota_ip, _ota_udp_port);

libraries/WiFi/src/BearSSLHelpers.cpp

@@ -29,7 +29,8 @@
 #include <string.h>
 #include <Arduino.h>
 #include "StackThunk.h"
-//#include <Updater_Signing.h>
+
+#include <Updater_Signing.h>
 #ifndef ARDUINO_SIGNING
 #define ARDUINO_SIGNING 0
 #endif