fix: improve error checking on errorBody decoding

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: HashEngineering

features/exploredash/src/main/java/org/dash/wallet/features/exploredash/repository/CTXSpendRepository.kt

@@ -47,7 +47,15 @@ class CTXSpendException(
 
     init {
         val type = object : TypeToken<Map<String, Any>>() {}.type
-        errorMap = Gson().fromJson(errorBody, type)
+        errorMap = try {
+            if (errorBody != null) {
+                Gson().fromJson(errorBody, type) ?: emptyMap()
+            } else {
+                emptyMap()
+            }
+        } catch (e: Exception) {
+            emptyMap()
+        }
     }
 
     val isLimitError