MASSIVELY streamlined theme setting process, now EVERYTHING happens in a vuex action "setTheme" instead of several different applyTheme()s scattered around

src/services/theme_data/theme2_to_theme3.js

@@ -265,6 +265,7 @@ export const convertTheme2To3 = (data) => {
     const newRules = []
     Object.keys(data.fonts || {}).forEach(key => {
       if (!fontsKeys.has(key)) return
+      if (!data.fonts[key]) return
       const originalFont = data.fonts[key].family
       const rule = { source: '2to3' }