Add ISR logging failsafe

tasmota/tasmota_support/support.ino

@@ -2570,6 +2570,15 @@ uint32_t HighestLogLevel() {
 }
 
 void AddLog(uint32_t loglevel, PGM_P formatP, ...) {
+#ifdef ESP32
+  if (xPortInIsrContext()) {
+    // When called from an ISR, you should not send out logs.
+    // Allocating memory from within an ISR is a big no-no.
+    // Also long-time blocking like sending logs (especially to a syslog server) 
+    // is also really not a good idea from an ISR call.
+    return;
+  }
+#endif
   uint32_t highest_loglevel = HighestLogLevel();
 
   // If no logging is requested then do not access heap to fight fragmentation