[BUG-FIX] javascript in cmd doc page does not handle absence of cmd options (#472)

closes microsoft/bedrock#1278

Author: dennisseah

docs/commands/spk.js

@@ -91,7 +91,7 @@ function showDetails(key) {
   );
   content = content.replace("@@cmd-description@@", cmd.description);
 
-  var options = cmd.options.reduce(function(a, c) {
+  var options = (cmd.options || []).reduce(function(a, c) {
     a += optionTemplate
       .replace("@@option@@", sanitize(c.arg))
       .replace("@@description@@", sanitize(c.description));