Quickly fixing some stuff from the last update.

v0.4.5 fixes more issues related to states using nil.

The following fixes were made:

• Fixed an issue where Use would return incorrect data when it was used on a computed or rendered instance returning nil
• Fixed an issue where GetValue would return incorrect data when it was used on a computed or rendered instance returning nil
• GetValue better differenciates between states and non-states now
• Fixed IsState returning false on computed and rendered instances