Remove task env if empty/null

[lucasfcnunes]

Description

Empty env in task should override global env unsetting it instead of making it empty text.

Cases

Taskfile.yaml

version: '3'
env:
  CASE_1: GO-TASK
tasks:
  1.a:
    env:
      CASE_1:
    cmds:
      - defer: env | grep CASE_1=
  1.b:
    env:
      CASE_1:
    cmds:
      - defer: unset CASE_1 && env | grep CASE_1=
  2:
    env:
      CASE_2:
    cmds:
      - defer: env | grep CASE_2=
  3:
    env:
      CASE_3: null
    cmds:
      - defer: env | grep CASE_3=
  4:
    env:
      CASE_4: ''
    cmds:
      - defer: env | grep CASE_4=
  5:
    cmds:
      - defer: env | grep CASE_5=

Results

$ task 1.a 1.b 2 3 4 5
task: [1.a] env | grep CASE_1=
CASE_1=
task: [1.b] unset CASE_1 && env | grep CASE_1=
task: [2] env | grep CASE_2=
CASE_2=
task: [3] env | grep CASE_3=
CASE_3=
task: [4] env | grep CASE_4=
CASE_4=
task: [5] env | grep CASE_5=

Proposal

• empty text ('') => set, 'CASE_X=' (like 1.a, 2, 3, 4)
• empty = null (in yaml) => unset, no CASE_X (like 1.b, 5)