Fix for empty error objects in response breaking extraction of domain validation types

Fix for empty error objects in the response which mess up the extraction of domain validation types due to the closing brace in the error object prematurely matching the end of the search pattern.

This seems to be a recent change with ZeroSSL in particular where "error":{} is being included in responses.

There could potentially be a related issue if there is a complex error object ever returned in the validation check response where an embedded sub-object could lead to an incomplete extraction of the error message, roughly around line 5040.

Adapted from fix suggested here: https://github.com/acmesh-official/acme.sh/issues/4933#issuecomment-1870499018

acme.sh

@@ -4722,7 +4722,8 @@ $_authorizations_map"
         _debug keyauthorization "$keyauthorization"
       fi
 
-      entry="$(echo "$response" | _egrep_o '[^\{]*"type":"'$vtype'"[^\}]*')"
+      # Fix for empty error objects in response which mess up the original code, adapted from fix suggested here: https://github.com/acmesh-official/acme.sh/issues/4933#issuecomment-1870499018
+      entry="$(echo "$response" | sed s/'"error":{}'/'"error":null'/ | _egrep_o '[^\{]*"type":"'$vtype'"[^\}]*')"
       _debug entry "$entry"
 
       if [ -z "$keyauthorization" -a -z "$entry" ]; then
@@ -6283,7 +6284,8 @@ _deactivate() {
     fi
     _debug "Trigger validation."
     vtype="$(_getIdType "$_d_domain")"
-    entry="$(echo "$response" | _egrep_o '[^\{]*"type":"'$vtype'"[^\}]*')"
+    # Fix for empty error objects in response which mess up the original code, adapted from fix suggested here: https://github.com/acmesh-official/acme.sh/issues/4933#issuecomment-1870499018
+    entry="$(echo "$response" | sed s/'"error":{}'/'"error":null'/ | _egrep_o '[^\{]*"type":"'$vtype'"[^\}]*')"
     _debug entry "$entry"
     if [ -z "$entry" ]; then
       _err "Error, can not get domain token $d"