According to the documentation of ivy-count-format, user should be able to set it to nil for disabling the count feature, but now it won't work since ivy-count-format has to be a string, otherwise if its value is nil, a "wrong-type-argument" error will raise.
Using an empty string is easier. No longer needed to check for nil when
using `string-match', `concat' etc.
* doc/Changelog.org: Update.
* ivy.el (ivy-count-format): Update doc and customize type.
(ivy--reset-state): Error if `ivy-count-format' nil is encountered.
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