MetricsFilter should pass request to next filter in the chain if unab…

…le to time (fixes #224)

micrometer-spring-legacy/src/main/java/io/micrometer/spring/web/servlet/MetricsFilter.java

@@ -60,6 +60,7 @@ protected void doFilterInternal(HttpServletRequest request, HttpServletResponse
             handler = matchableHandlerMapping.getHandler(request);
         } catch (Exception e) {
             logger.debug("Unable to time request", e);
+            filterChain.doFilter(request, response);
             return;
         }