After you file

No. The form cannot be left blank or contain a -0-. According to FTb.ca.gov below are reasons HOH filing status are denied:
Avoid common mistakes

Here are the most common reasons you may be denied the HOH filing status:

• Your qualifying child or relative’s gross income is above the limit
• Your qualifying child lived with you less than 183 days
• You and someone else claimed the same qualifying person, or used the same address
• You are married and claimed a qualifying relative
• You didn’t attach a completed Head of Household Filing Status Schedule (FTB 3532)

Under the "General Rules":

• Your home was the main home for you and a qualifying person who lived with you for more than half the year.

The blank must be more that 183.

CALIFORNIA FORM 3532 Instructions