Fix a bug when appending to URLs with an empty query

NSURL+QueryDictionary/NSURL+QueryDictionary.m

@@ -26,7 +26,7 @@ - (NSURL*) uq_URLByAppendingQueryDictionary:(NSDictionary*) queryDictionary {
 - (NSURL *)uq_URLByAppendingQueryDictionary:(NSDictionary *)queryDictionary
                           withSortedKeys:(BOOL)sortedKeys
 {
-  NSMutableArray *queries = self.query ? @[self.query].mutableCopy : @[].mutableCopy;
+  NSMutableArray *queries = [self.query length] > 0 ? @[self.query].mutableCopy : @[].mutableCopy;
   NSString *dictionaryQuery = [queryDictionary uq_URLQueryStringWithSortedKeys:sortedKeys];
   if (dictionaryQuery) {
     [queries addObject:dictionaryQuery];

UnitTests/UnitTests.m

@@ -53,6 +53,14 @@ - (void) testShouldAppendASimpleQuery {
                         @"Did not create correctly formatted URL");
 }
 
+- (void) testShouldAppendWhenURLContainsJustQueryBegin {
+    NSDictionary *dict = @{@"key":@"value"};
+    XCTAssertEqualObjects([URL(@"http://www.foo.com/path?")
+        uq_URLByAppendingQueryDictionary:dict].absoluteString,
+    @"http://www.foo.com/path?key=value",
+    @"Did not create correctly formatted URL");
+}
+
 - (void) testShouldAppendToExistingQueryWithFragment {
   NSDictionary *dict = @{@"cat":@"cheese", @"foo":@"bar"};
   XCTAssertEqualObjects([URL(@"http://www.foo.com?aKey=aValue&another=val2#fragment")