fix(numberFilter): fix formatting when "0" passed as fractionSize

When checking to add decimal and trialing 0s number filter used to check
trueness of fractionSize. "0" evaluating to true causes "123" to return "123."

Author: kkruit

src/ng/filter/filters.js

@@ -168,7 +168,7 @@ function formatNumber(number, pattern, groupSep, decimalSep, fractionSize) {
       fraction += '0';
     }
 
-    if (fractionSize) formatedText += decimalSep + fraction.substr(0, fractionSize);
+    if (fractionSize && fractionSize !== "0") formatedText += decimalSep + fraction.substr(0, fractionSize);
   }
 
   parts.push(isNegative ? pattern.negPre : pattern.posPre);

test/ng/filter/filtersSpec.js

@@ -71,6 +71,17 @@ describe('filters', function() {
       var num = formatNumber(123.1116, pattern, ',', '.');
       expect(num).toBe('123.112');
     });
+
+		it('should format the same with string as well as numeric fractionSize', function(){
+			var num = formatNumber(123.1, pattern, ',', '.', "0");
+      expect(num).toBe('123');
+			var num = formatNumber(123.1, pattern, ',', '.', 0);
+      expect(num).toBe('123');
+			var num = formatNumber(123.1, pattern, ',', '.', "3");
+      expect(num).toBe('123.100');
+			var num = formatNumber(123.1, pattern, ',', '.', 3);
+      expect(num).toBe('123.100');
+		});
   });
 
   describe('currency', function() {