Description of problem:
The grub2-mkconfig script, particular the 10_linux helper, generates two lines with `search --fs-uuid --set=root [UUID]`.

Snippet of generated grub.cfg (commented):
```
### BEGIN /etc/grub.d/10_linux ###
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root 65b145b1-1906-4b7a-b80d-d73945995a3c # actual root partition, contains /boot
insmod part_gpt
insmod fat
search --no-floppy --fs-uuid --set=root E34E-23EE # EFI system partition, remove this line to solve the issue

# many comments

if [ -z "${kernelopts}" ]; then
  set kernelopts="root=UUID=65b145b1-1906-4b7a-b80d-d73945995a3c ro  "
fi

insmod blscfg
blscfg
### END /etc/grub.d/10_linux ###
```

This error prevents the blscfg module from loading the menu entries. The system is only bootable via GRUB CLI.

Version-Release number of selected component (if applicable):
grub2-common-2.06~rc1-1.fc34.noarch
grub2-tools-minimal-2.06~rc1-1.fc34.x86_64
grub2-tools-2.06~rc1-1.fc34.x86_64
grub2-pc-modules-2.06~rc1-1.fc34.noarch
grub2-pc-2.06~rc1-1.fc34.x86_64
grub2-efi-ia32-2.06~rc1-1.fc34.x86_64
grub2-tools-extra-2.06~rc1-1.fc34.x86_64
grub2-efi-ia32-cdboot-2.06~rc1-1.fc34.x86_64
grub2-efi-x64-cdboot-2.06~rc1-1.fc34.x86_64
grub2-efi-x64-modules-2.06~rc1-1.fc34.noarch
grub2-tools-efi-2.06~rc1-1.fc34.x86_64
grub2-efi-x64-2.06~rc1-1.fc34.x86_64

How reproducible:
Simply install or upgrade, or run `grub2-mkconfig`

Actual results:
No Linux menu entries in GRUB

Expected results:
Normal menu entries

Additional info:
/etc/default/grub:
```
GRUB_TIMEOUT=1
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="resume=UUID=88514c41-3b12-4e82-ad2f-6abf00da67f9 rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_ENABLE_BLSCFG=true
```