erp5_api_style: Add Ugly code because customer dotnet sends strange characters before JSON

bt5/erp5_api_style/SkinTemplateItem/portal_skins/erp5_api_style/ERP5Site_asjIOStyle.py

@@ -4,6 +4,10 @@ from zExceptions import NotFound
 # an external script is need to extract content from body: REQUEST.get('BODY')
 mode = mode or context.REQUEST.form.get("mode", "get")
 text_content = text_content or context.REQUEST.form.get("text_content", "")
+# Ugly code because dotnet sends strange characters before JSON
+while text_content and text_content[0] != "{":
+  text_content = text_content[1:]
+
 document_id = document_id or context.REQUEST.form.get("document_id", "")
 
 web_section_value = context.getWebSectionValue()