fix(minicom): do not generate empty completions

With the current implementation, an empty completion would be
generated when there is a file whose basename is `minirc.`.  In this
patch, we filter such files in the pathname-expansion phase by
requiring at least one character after `minirc.` in the filenames.

Author: akinomyoga

completions/minicom

@@ -34,7 +34,7 @@ _minicom()
     fi
 
     local -a files
-    _comp_expand_glob files '/etc/minirc.* /etc/minicom/minirc.* ~/.minirc.*'
+    _comp_expand_glob files '{/etc/,/etc/minicom/,~/.}minirc.?*'
     ((${#files[@]})) &&
         COMPREPLY=($(compgen -W '"${files[@]##*minirc.}"' -- "$cur"))
 } &&