correctly handle unknown syntaxes when highlighting

syntax_wrapper.sh

@@ -0,0 +1,11 @@
+#! /usr/bin/env bash
+
+if [[ "$#" -lt 2 ]]; then
+    printf "<code>$(cat)</code>"
+fi
+
+if grep -qw ${name:-} <<< $(pygmentize -L lexers); then
+    pygmentize -l $1 -f html | head -c -13 | awk -F '<pre>' '{print $NF}'
+else
+    printf "<code>$(cat)</code>"
+fi