Ensure curl is either storing a valid token or a meaningful error message

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/Scripts/piholeDebug.sh

@@ -1334,9 +1334,14 @@ curl_to_tricorder() {
     # Users can submit their debug logs using curl (encrypted)
     log_write "    * Using ${COL_GREEN}curl${COL_NC} for transmission."
     # transmit he log via TLS and store the token returned in a variable
-    tricorder_token="$(curl --no-progress-meter --upload-file ${PIHOLE_DEBUG_LOG} https://tricorder.pi-hole.net)"
-    if [ -z "${tricorder_token}" ]; then
+    tricorder_token=$(curl --silent --fail --show-error --upload-file ${PIHOLE_DEBUG_LOG} https://tricorder.pi-hole.net 2>&1)
+    if [[ "${tricorder_token}" != "https://tricorder.pi-hole.net/"* ]]; then
         log_write "    * ${COL_GREEN}curl${COL_NC} failed, contact Pi-hole support for assistance."
+        # Log curl error (if available)
+        if [ ! -z "${tricorder_token}" ]; then
+            log_write "    * Error message: ${COL_RED}${tricorder_token}${COL_NC}\\n"
+            tricorder_token=""
+        fi
     fi
 }