[Feature Request] Add verbose error message when a trailing / is used for a service widget

[MountainGod2]

Description

I know it's pretty clearly defined in the docs for the services widgets, but I thought I might solicit some thoughts/opinions regarding adding an error message specifically for instances where the widget URL contains a trailing forward slash, in turn causing the widget to fail to load.

Once someone knows, it's pretty easy to check for, and like I said it is in the docs. But for a new user setting up Homepage, an error such as TypeError: d is undefined" is likely less helpful for diagnosing when compared to a more specific message pointing them towards the error.

Anyways, just a thought I had, as I've seen a few people in the discord make this mistake over the past couple days and I figured a clearer error message could possibly be a way to mitigate it a bit and hopefully cut down on the amount.

Other

A few examples of the types of errors in question from the previous two days or so.

https://discord.com/channels/1019316731635834932/1019316732797653086/1115188276630925374
https://discord.com/channels/1019316731635834932/1019316732797653086/1115198006527021066
https://discord.com/channels/1019316731635834932/1019316732797653086/1115747801666699344

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