Minor cleanup on recently-merged code, for consistency.

jquery.flot.js

@@ -671,17 +671,17 @@
                     var delta;
 
                     switch (s.bars.align) {
-                        case 'left':
+                        case "left":
                             delta = 0;
                             break;
-                        case 'right':
+                        case "right":
                             delta = -s.bars.barWidth;
                             break;
-                        case 'center':
+                        case "center":
                             delta = -s.bars.barWidth / 2;
                             break;
                         default:
-                            throw 'Invalid bar alignment: ' + s.bars.align;
+                            throw new Error("Invalid bar alignment: " + s.bars.align);
                     }
 
                     if (s.bars.horizontal) {
@@ -2229,17 +2229,17 @@
             var barLeft;
 
             switch (series.bars.align) {
-                case 'left': 
+                case "left":
                     barLeft = 0;
                     break;
-                case 'right':
+                case "right":
                     barLeft = -series.bars.barWidth;
                     break;
-                case 'center':
+                case "center":
                     barLeft = -series.bars.barWidth / 2;
                     break;
                 default:
-                    throw 'Invalid bar alignment: ' + series.bars.align;
+                    throw new Error("Invalid bar alignment: " + series.bars.align);
             }
 
             var fillStyleCallback = series.bars.fill ? function (bottom, top) { return getFillStyle(series.bars, series.color, bottom, top); } : null;