Check global vue config exists before installing vue 2 handler #2171
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Goal
Fixes an error in the Vue plugin initialisation when using Vue 3+ via CDN (reported in #2150)
Design
Currently the plugin attempts to install the Vue 2 handler (via the global Vue.config) if a global Vue object exists, but CDN builds of Vue 3+ will also expose a global Vue object.
This PR updates the check in plugin load to ensure that Vue.config exists before installing the Vue 2 handler.
Testing
Added a new unit test and tested manually with a Vue 3 CDN build.