End slash in the social icon url error

[Info 3bits]

If the URL has a trailing slash, a warning is displayed: Undefined offset: 1 .... in line 550 in renderers.php

I don't see any major impact but we could indicate it in the settings page to avoid problems

[Jeremy Hopkins]

Fix #349

→ <<cset be0978d71a14>>

[Jeremy Hopkins]

I cannot replicate this, it may have been resolved by a previous change but do not think that is the case.

What did cause errors were empty lines below the delimited fields which I have just corrected.

[Info 3bits]

Tested with and without trailing slash and no issues detected