fix replaces cannot contain an empty string

deoplete/PKGBUILD

@@ -12,7 +12,7 @@ _neovim="n"
 _name='deoplete'
 pkgname="${_name}"
 pkgver=6.1
-pkgrel=1
+pkgrel=2
 pkgdesc="deoplete completion plugin for neovim"
 arch=('any')
 url="https://github.com/Shougo/deoplete.nvim"
@@ -26,7 +26,7 @@ optdepends=('vim: vim support'
 makedepends=('git') 
 provides=('deoplete')
 conflicts=('deoplete-git')
-replaces=('')
+replaces=()
 backup=()
 options=()
 install="${_name}.install"