fix regression in support for font property. fixes less#1429

Author: lukeapage

lib/less/tree/rule.js

@@ -35,7 +35,7 @@ tree.Rule.prototype = {
     },
     eval: function (env) {
         var strictMathBypass = false;
-        if (this.name === "font" && env.strictMath === false) {
+        if (this.name === "font" && !env.strictMath) {
             strictMathBypass = true;
             env.strictMath = true;
         }

test/less-test.js

@@ -63,7 +63,7 @@ runTestSet({strictMath: true, dumpLineNumbers: 'all'}, "debug/", null,
            function(name) { return name + '-all'; });
 runTestSet({strictMath: true, relativeUrls: false, rootpath: "folder (1)/"}, "static-urls/");
 runTestSet({strictMath: true, compress: true}, "compression/");
-runTestSet({strictMath: false}, "legacy/");
+runTestSet({ }, "legacy/");
 testNoOptions();
 
 function globalReplacements(input, directory) {