minor fix

Author: blackart

Diff for: lib/anychart-node.js

@@ -61,9 +61,12 @@
       elem.getBBox = function() {
         var text = elem.innerHTML;
         var fontSize = parseFloat(elem.getAttribute('font-size'));
-        var fontFamily = elem.getAttribute('font-family').toLowerCase();
-        var fontWeight = elem.getAttribute('font-weight').toLowerCase();
-        var fontStyle = elem.getAttribute('font-style').toLowerCase();
+        var fontFamily = elem.getAttribute('font-family');
+        if (fontFamily) fontFamily = fontFamily.toLowerCase();
+        var fontWeight = elem.getAttribute('font-weight');
+        if (fontWeight) fontWeight = fontWeight.toLowerCase();
+        var fontStyle = elem.getAttribute('font-style');
+        if (fontStyle) fontStyle = fontStyle.toLowerCase();
 
         var fontsArr = fontFamily.split(', ');
 
@@ -77,8 +80,6 @@
         if (!font)
           font = fonts['verdana'];
 
-        // if (!font) console.log(fontFamily, fonts);
-
         var scale = 1 / font.unitsPerEm * fontSize;
 
         var top = -font.ascender * scale;