epub converter: small fix

src/docx_converter.py

@@ -230,6 +230,7 @@ class Book:
         self.logger_object.log('End of the test.')
 
     def conversion(self):
+        try:
             self.logger_object.log('Beginning of conversion from .docx to .json.')
             self.get_docx()
             self.book_api_wrapper.set_process_status()
@@ -250,6 +251,11 @@ class Book:
             self.write_to_json(content_dict)
             self.send_json_content(content_dict)
             self.logger_object.log(f'End of the conversion to LawCarta format. Check {self.output_path}.')
+        except Exception as exc:
+            self.logger_object.log('Error has occurred while conversion.', logging.ERROR)
+            self.logger_object.log_error_to_main_log(str(exc))
+            self.book_api_wrapper.set_error_status()
+            raise exc
 
 
 if __name__ == "__main__":