parameter expansion null check fails for arrays when [*] or [@] is used

Bash fails to correctly test for parameter to be unset or null when the parameter is an array reference [*] or [@]. Repeat-By: myvar[0]= echo "${myvar[0]:+nonnull}" -> OK echo "${myvar[*]:+nonnull}" nunnull -> not OK, because "${myvar[*]}" is

bash variable expansion ${var:+"..."} in here-document removes double quotes

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-unknown-linux-gnu' -DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/local/share