fix for unhandled body parse error

Author: alex.khalevine

.gitignore

@@ -1,3 +1,4 @@
+.DS_Store
 /.bundle/
 /.yardoc
 /Gemfile.lock

lib/eversign/client.rb

@@ -155,10 +155,12 @@ def send_reminder_for_document(document_hash, signer_id)
     private
 
     def append_sdk_id (body) 
-      unless body.nil?
+      begin
         bodyHash = JSON.parse(body)
         bodyHash['client'] = 'ruby-sdk'
         return bodyHash.to_json
+      rescue 
+        return body
       end
     end
 
@@ -173,6 +175,7 @@ def execute_request(method, path, body = nil, multipart = false)
 
       body = append_sdk_id(body)
 
+
       @faraday.send(method) do |request|
         request.url path
         request.body = body if body