Fixed lint problems.

Signed-off-by: Sebastian Haas <sebastian@haas.tech>

demo/demo.js

@@ -93,7 +93,7 @@
                 canvas.width = width;
                 try {
                 sheet.render();
-                } catch (e) {};
+                } catch (e) {}
                 enable();
             }
         );
@@ -116,7 +116,6 @@
     }
 
     function Resize(startCallback, endCallback) {
-      "use strict";
 
       var rtime;
       var timeout = false;

src/OSMD/OSMD.ts

@@ -155,7 +155,7 @@ export class OSMD {
      * @param: content can be `trace`, `debug`, `info`, `warn` or `error`.
      */
     public setLogLevel(level: string): void {
-        switch(level) {
+        switch (level) {
             case "trace":
                 log.setDefaultLevel(LogLevel.TRACE);
                 break;