REG: Percentage field taking zero value

[Kiran Kumar]

   I have an issue with a percentage field so it is not taking the 0 value is there a work around.Can anyone let me know best possible way to solve this!!

Is this a salesforce bug
https://success.salesforce.com/ideaView?id=08730000000ZvAvAAK

dealExpense =  format(l.Deal_Expense__c, false, false);
                 system.debug('l.Deal_Expense__c '+l.Deal_Expense__c);
                if(dealExpense == null || dealExpense=='0.00'){
                system.debug('l.Deal_Expense__c '+l.Deal_Expense__c);
                
                     dealExpense = '15.00';
                }

It is working fine for all other numbers except for '0'.

It is in the opportunity detail extension controller just search for deal expense.

It is storing 0 at the backend in the field when we soql we are seeing that it is storing 0 but on the UI it is defaulting to 15.00.

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Thanks&Regards
Kiran Amada.