core: Fix TestContext2Apply_destroyDeeplyNestedModule
core: Fix TestContext2Apply_destroyDeeplyNestedModule

The new state.String() has slightly different output for an empty state,
so we'll test that it's empty in a more direct way.

brandontosch/terraform,heimweh/terraform,tpounds/terraform,tpounds/terraform,VladRassokhin/terraform,VladRassokhin/terraform,pryorda/terraform,pdecat/terraform,pdecat/terraform,gechr/terraform,apparentlymart/terraform,pdecat/terraform,tommynsong/terraform,hashicorp/terraform,rnaveiras/terraform,apparentlymart/terraform,brandontosch/terraform,tommynsong/terraform,rnaveiras/terraform,pradeepbhadani/terraform,drebes/terraform,rnaveiras/terraform,tommynsong/terraform,heimweh/terraform,brandontosch/terraform,luis-silva/terraform,hashicorp/terraform,iljaskevic/terraform,youhong316/terraform,pryorda/terraform,youhong316/terraform,apparentlymart/terraform,apparentlymart/terraform,iljaskevic/terraform,iljaskevic/terraform,pryorda/terraform,iljaskevic/terraform,pdecat/terraform,pradeepbhadani/terraform,tpounds/terraform,nlamirault/terraform,heimweh/terraform,drebes/terraform,ewbankkit/terraform,nlamirault/terraform,ewbankkit/terraform,mattray/terraform,drebes/terraform,VladRassokhin/terraform,mattray/terraform,luis-silva/terraform,VladRassokhin/terraform,youhong316/terraform,apparentlymart/terraform,youhong316/terraform,luis-silva/terraform,ewbankkit/terraform,ewbankkit/terraform,brandontosch/terraform,drebes/terraform,luis-silva/terraform,mattray/terraform,mattray/terraform,brandontosch/terraform,hashicorp/terraform,gechr/terraform,gechr/terraform,heimweh/terraform,pradeepbhadani/terraform,tpounds/terraform,heimweh/terraform,nlamirault/terraform