Add block null check test to Input test

Author: adazem009

test/scratch_classes/input_test.cpp

@@ -58,4 +58,9 @@ TEST(InputTest, ValueBlock)
     input.setValueBlockId("hello");
     ASSERT_EQ(input.valueBlockId(), "hello");
     ASSERT_EQ(input.valueBlock(), nullptr);
+
+    input.setValueBlock(block);
+    input.setValueBlock(nullptr);
+    ASSERT_EQ(input.valueBlock(), nullptr);
+    ASSERT_EQ(input.valueBlockId(), "");
 }