Fixing Redirect Loop in Main.js (and other small fixes)

[mattxwang]

This is a lightning-quick PR to fix a whitescreen issue that we didn't realize was happening; namely, if you had no sketches, you'd be stuck in an infinite whitescreen redirect on the /sketches route. This PR fixes that by adding a check on the current contentType, and moves the check out of the constructor and performing the check at render. It also removes some other unused code in the Main.js file.

Abbreviated changelog:

• fixes redirect loop to sketches by making sure to check the current contentType, moves it out of the constructor and state scope
• removes unused renderDropdown() and Dropdown import
• makes sketches the default renderContent
• removes redundant renderSketchesPage() function

[mattxwang]

Hey @krashanoff or @jamieliu386, can one of you take a quick look and verify that /sketches doesn't break for you when you have no more sketches on this branch?

[krashanoff]

Hey Matt! Fixed up the issues for me and LGTM in my opinion, but would probably want a second opinion from @jamieliu386.

[jamieliu386]

Hi Matt! The sketches view looks fine to me now, but clicking the editor button in the profile panel gives me a screen that looks like this:

[mattxwang]

Hi Matt! The sketches view looks fine to me now, but clicking the editor button in the profile panel gives me a screen that looks like this:

Ah yeah, good catch didn't realize that! Will work on a better route for Editor rn!

[mattxwang]

Cool, this latest commit should fix that problem. @jamieliu386 do you mind giving it a spin again?

[jamieliu386]

LGTM, thanks Matt!