Third Party nodes not found when using global npm install

[joepavitt]

Current Behavior

• https://discourse.nodered.org/t/dashboard-2-ui-led-not-displaying/94609/
• https://discourse.nodered.org/t/dashboard-2-custom-nodes-not-loading-when-installed-globally/94546/

Expected Behavior

Given that Node-RED supports the global installation of nodes, Dashboard should too

Steps To Reproduce

See attached Discourse topics

Environment

• Dashboard version:
• Node-RED version:
• Node.js version:
• npm version:
• Platform/OS:
• Browser:

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