Update MD037/no-space-in-emphasis to ignore emphasis on code fences and not report violations for scenarios that span an empty code fence (fixes #381).

test/spaces-inside-emphasis-markers-multiple-lines.md

@@ -120,3 +120,10 @@ multi-line emphasis
 scenario * that
 should * not trigger
 violations * either`.
+
+<!-- markdownlint-disable MD031 -->
+*text
+```text
+```
+text *
+<!-- markdownlint-restore -->

test/spaces_inside_emphasis_markers.md

@@ -341,3 +341,7 @@ text [reference*link] star * star text
 | x** y | x** y |
 | x _ y | x _ y |
 | x__ y | x__ y |
+
+```yaml /* autogenerated */
+# YAML...
+```