1) Has your employer given you his form 16 at least. Since your 26AS is not updated this form 16 is not from Traces.
2) Goto https://tin.tin.nsdl.com/oltas/servlet/QueryTaxpayer and check whethe tax has been deposit in Govt Coffers
3) 26AS is blank does not necessarily mean he has not paid tax. He may have paid tax but not filed TDS return. He may have filed TDS return but PAN no may be wrong or it may be a defective return .
4) if he has given his form 16 with his sign and stamp then you are protected u/s 205. The onus of giving tax is not with you but your Employer.
5) Tell your employer that Tax credits in 26AS is missing.
6) You can file your return with the data given in your form 16.
7) You should not e-verify or send Itr-V to banalore- untill your 26AS is updated
8) The day 26As is updated either -Everifyy or send ITR-v to bangalore
9) Remember ITR-v for AY 13-14 and . AY 2014-15 can still be send to CPC banglore till 31st OCt 2015.
10) Relentlessy follow with your employer to update 26AS and then do s.no 8
I hope this is clear