throw spdlog_err on format errors

include/spdlog/details/pattern_formatter_impl.h

@@ -573,6 +573,8 @@ inline void spdlog::pattern_formatter::handle_flag(char flag)
 
 
 inline void spdlog::pattern_formatter::format(details::log_msg& msg)
+{
+    try
     {
         for (auto &f : _formatters)
         {
@@ -581,3 +583,8 @@ inline void spdlog::pattern_formatter::format(details::log_msg& msg)
         //write eol
         msg.formatted.write(details::os::eol(), details::os::eol_size());
     }
+    catch(const fmt::FormatError& e)
+    {
+        throw spdlog_ex(fmt::format("formatting error while processing format string: {}", e.what()));
+    }
+}