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Hi Diwakar here is the updated code, I just used this for mine- I added "-TBD-" when its blank
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "span",
"txtContent": "=getDate([$Start_Q3]) + '-' + if(getMonth(([$Start_Q3])=='','TBD-',if([$Start_Q3])==0,'Jan',if(getMonth([$Start_Q3])==1,'Feb',if(getMonth([$Start_Q3])==2,'Mar',if(getMonth([$Start_Q3])==3,'Apr',if(getMonth([$Start_Q3])==4,'May',if(getMonth([$Start_Q3])==5,'Jun',if(getMonth([$Start_Q3])==6,'Jul',if(getMonth([$Start_Q3])==7,'Aug',if(getMonth([$Start_Q3])==8,'Sept',if(getMonth([$Start_Q3])==9,'Oct',if(getMonth([$Start_Q3])==10,'Nov','Dec'))))))))))) + '-' + getYear([$Start_Q3])"
}
Let me know if this helps