Avoid 800+ blank lines in registry JSON file

[chalin]

Prior to this fix, the registry JSON file had 866 blank lines at the start of it :)

$ grep -e '^\s*$' public/ecosystem/registry/index.json | wc -l
     866

With this fix:

$ grep -e '^\s*$' public/ecosystem/registry/index.json | wc -l
     0