test_v doesn't work for associative arrays

[pskocik]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -D_FORTIFY_SOURCE=2 -g 
-O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat 
-Werror=format-security -Wall
uname output: Linux laptop 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 
09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 11
Release Status: release

Description:
        [Detailed description of the problem, suggestion, or complaint.]

Repeat-By:
#!/bin/bash
declare var
declare -a ary
declare -A asoc

var=1
ary=(1)
asoc[a]=1

for a in var ary asoc; do
   printf '%s\t' "$a"
   if test -v "$a"; then
     echo ✓
   else
     echo ✗ 
   fi
done

<<OUTPUTS
var     ✓
ary     ✓
asoc    ✗
OUTPUTS

Fix:
        [Description of how to fix the problem.  If you don't know a
        fix for the problem, don't include this section.]