Fail over to console.log if lacking console method

This improves logger resiliency under older browsers.

lib/handlebars/base.js

@@ -225,11 +225,9 @@ export var logger = {
 
   // Can be overridden in the host environment
   log: function(level, message) {
-    if (logger.level <= level) {
+    if (typeof console !== 'undefined' && logger.level <= level) {
       var method = logger.methodMap[level];
-      if (typeof console !== 'undefined' && console[method]) {
-        console[method].call(console, message);
-      }
+      (console[method] || console.log).call(console, message);
     }
   }
 };

spec/builtins.js

@@ -276,7 +276,7 @@ describe('builtin helpers', function() {
       equals(3, levelArg);
       equals("whee", logArg);
     });
-    it('should not output to info', function() {
+    it('should output to info', function() {
       var string = "{{log blah}}";
       var hash   = { blah: "whee" };
 
@@ -284,6 +284,10 @@ describe('builtin helpers', function() {
         equals("whee", log);
         called = true;
       };
+      console.log = function(log) {
+        equals("whee", log);
+        called = true;
+      };
 
       shouldCompileTo(string, hash, "");
       equals(true, called);