David Briscoe 74f1f0d990 Return nothing when there is no lsp-progress
Fix: a literal '0' appears after filename on older versions of vim-lsp.

0c8164b1b3c8017770296320a67a164b3c2aad39 added support for showing lsp
progress, but didn't always explicitly return a value. Vim uses 0 as a
return value when none are supplied, so when used with an older version
of vim-lsp that doesn't have the progress feature a 0 appeared in the
statusline.
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