I hope that you are right and that the IRS won't mind.
What has me worried is their help topic says this on the first bullet, using the word MUST.
One CPA. I spoke with said no problem. Another said that I should have signed it. So that's why I came here to ask you guy
- If there's an appointed personal representative, he or she must sign the return. If it's a joint return, the surviving spouse must also sign it.
- If you're a surviving spouse filing a joint return and there's no appointed personal representative, you should sign the return and write in the signature area "Filing as surviving spouse." A surviving spouse can file joint returns for the taxable year in which the death occurred and, if the death occurred before filing the return, for the taxable year immediately before the year of death.
- If there's no appointed personal representative and there's no surviving spouse, the person in charge of the decedent's property must file and sign the return as "personal representative."
https://www.irs.gov/taxtopics/tc356
