Friendlier error message if user enters a bad expression

[joshuar]

If I enter something other than a .es() function in the (search?) bar, I get the following error:

Timelion: Error: Expected: "$" @ character undefined
OK
Error: Expected: "$" @ character undefined
    at /opt/kibana/installedPlugins/timelion/handlers/lib/parse_sheet.js:15:15
    at arrayMap (/opt/kibana/node_modules/lodash/index.js:1406:25)
    at Function.map (/opt/kibana/node_modules/lodash/index.js:6710:14)
    at parseSheet (/opt/kibana/installedPlugins/timelion/handlers/lib/parse_sheet.js:9:12)
    at Object.processRequest (/opt/kibana/installedPlugins/timelion/handlers/chain_runner.js:172:11)
    at handler (/opt/kibana/installedPlugins/timelion/routes/sheet.js:24:29)
    at Object.internals.handler (/opt/kibana/node_modules/hapi/lib/handler.js:93:36)
    at /opt/kibana/node_modules/hapi/lib/handler.js:28:23
    at [object Object].internals.Protect.run (/opt/kibana/node_modules/hapi/lib/protect.js:56:5)
    at exports.execute (/opt/kibana/node_modules/hapi/lib/handler.js:22:22)
    at /opt/kibana/node_modules/hapi/lib/request.js:370:13
    at iterate (/opt/kibana/node_modules/hapi/node_modules/items/lib/index.js:35:13)
    at done (/opt/kibana/node_modules/hapi/node_modules/items/lib/index.js:27:25)
    at /opt/kibana/node_modules/hapi/node_modules/hoek/lib/index.js:841:22
    at process._tickDomainCallback (node.js:381:11)

This could be a more informative and shorter error telling the user they need to enter a .es() format, or even bring up the tutorial again?