first create one parameter with string.
Create calculation as [Search]
CONTAINS(str([Project Id]),([Search Project ID]))
I have add str because project id is int.
Drag this into filter and select true.
Show parameter and type ' '
It will default show blank report always.
Set action filter and link to this sheet. once link goes to that sheet then it will show blank report. once we can type project id then it will show report.