Add changelog entry, add additional test case

client_test.go

@@ -590,6 +590,11 @@ func TestClientEnqueueError(t *testing.T) {
 			task: NewTask("", h.JSON(map[string]interface{}{})),
 			opts: []Option{},
 		},
+		{
+			desc: "With blank task typename",
+			task: NewTask("    ", h.JSON(map[string]interface{}{})),
+			opts: []Option{},
+		},
 	}
 
 	for _, tc := range tests {