complete condition command

`test` command to check `$LS_COMMON` argument exists. and merged
the next line.

aliases/available/msys2.aliases.bash

@@ -7,10 +7,9 @@ LS_COMMON="-hG"
 LS_COMMON="$LS_COMMON --color=auto"
 LS_COMMON="$LS_COMMON -I NTUSER.DAT\* -I ntuser.dat\*"
 
-test -n "$LS_COMMON" &&
-
 # alias
-alias ls="command ls $LS_COMMON"
+# setup the main ls alias if we've established common args
+test -n "$LS_COMMON" && alias ls="command ls $LS_COMMON"
 alias ll="ls -l"
 alias la="ls -a"
 alias lal="ll -a"