added default height so this component can be tested (#355)
added default height so this component can be tested (#355)

Added min height so TreeFilter will be testable in enzyme. Problem was that in JSDOM height of the element wasn't setting, so no filter options were being rendered.
Acceleratio/quick-react.ts,SysKitTeam/quick-react.ts,SysKitTeam/quick-react.ts,Acceleratio/quick-react.ts