(#114) - add if for undefined seqs
(#114) - add if for undefined seqs

We don't want to bother leveldb with deletion of undefined keys
as we don't have to

mattbailey/pouchdb,mainerror/pouchdb,marcusandre/pouchdb,lukevanhorn/pouchdb,shimaore/pouchdb,optikfluffel/pouchdb,pouchdb/pouchdb,marcusandre/pouchdb,mattbailey/pouchdb,microlv/pouchdb,colinskow/pouchdb,tyler-johnson/pouchdb,cdaringe/pouchdb,seigel/pouchdb,mainerror/pouchdb,elkingtonmcb/pouchdb,KlausTrainer/pouchdb,johnofkorea/pouchdb,mikeymckay/pouchdb,asmiller/pouchdb,slaskis/pouchdb,lakhansamani/pouchdb,jhs/pouchdb,willholley/pouchdb,lukevanhorn/pouchdb,cshum/pouchdb,cesarmarinhorj/pouchdb,callahanchris/pouchdb,bbenezech/pouchdb,cshum/pouchdb,shimaore/pouchdb,cdaringe/pouchdb,willholley/pouchdb,mwksl/pouchdb,nickcolley/pouchdb,h4ki/pouchdb,optikfluffel/pouchdb,cdaringe/pouchdb,tohagan/pouchdb,jhs/pouchdb,daleharvey/pouchdb,nickcolley/pouchdb,h4ki/pouchdb,Knowledge-OTP/pouchdb,ntwcklng/pouchdb,HospitalRun/pouchdb,asmiller/pouchdb,p5150j/pouchdb,callahanchris/pouchdb,yaronyg/pouchdb,ntwcklng/pouchdb,lukevanhorn/pouchdb,p5150j/pouchdb,janraasch/pouchdb,cesarmarinhorj/pouchdb,janl/pouchdb,p5150j/pouchdb,Actonate/pouchdb,microlv/pouchdb,Dashed/pouchdb,ramdhavepreetam/pouchdb,garrensmith/pouchdb,TechnicalPursuit/pouchdb,slaskis/pouchdb,yaronyg/pouchdb,TechnicalPursuit/pouchdb,elkingtonmcb/pouchdb,caolan/pouchdb,cshum/pouchdb,jhs/pouchdb,slang800/pouchdb,lakhansamani/pouchdb,elkingtonmcb/pouchdb,cesarmarinhorj/pouchdb,janraasch/pouchdb,spMatti/pouchdb,KlausTrainer/pouchdb,callahanchris/pouchdb,microlv/pouchdb,ntwcklng/pouchdb,willholley/pouchdb,mwksl/pouchdb,pouchdb/pouchdb,Knowledge-OTP/pouchdb,crissdev/pouchdb,Dashed/pouchdb,HospitalRun/pouchdb,patrickgrey/pouchdb,garrensmith/pouchdb,mikeymckay/pouchdb,seigel/pouchdb,janl/pouchdb,shimaore/pouchdb,evidenceprime/pouchdb,bbenezech/pouchdb,greyhwndz/pouchdb,bbenezech/pouchdb,tohagan/pouchdb,Charlotteis/pouchdb,mwksl/pouchdb,mattbailey/pouchdb,nickcolley/pouchdb,tyler-johnson/pouchdb,adamvert/pouchdb,slaskis/pouchdb,daleharvey/pouchdb,Knowledge-OTP/pouchdb,greyhwndz/pouchdb,crissdev/pouchdb,slang800/pouchdb,optikfluffel/pouchdb,pouchdb/pouchdb,Actonate/pouchdb,colinskow/pouchdb,nicolasbrugneaux/pouchdb,TechnicalPursuit/pouchdb,seigel/pouchdb,mikeymckay/pouchdb,tohagan/pouchdb,crissdev/pouchdb,spMatti/pouchdb,johnofkorea/pouchdb,marcusandre/pouchdb,lakhansamani/pouchdb,ramdhavepreetam/pouchdb,nicolasbrugneaux/pouchdb,Actonate/pouchdb,mikeal/pouchdb,asmiller/pouchdb,adamvert/pouchdb,patrickgrey/pouchdb,h4ki/pouchdb,adamvert/pouchdb,spMatti/pouchdb,janraasch/pouchdb,colinskow/pouchdb,ramdhavepreetam/pouchdb,garrensmith/pouchdb,tyler-johnson/pouchdb,Charlotteis/pouchdb,greyhwndz/pouchdb,johnofkorea/pouchdb,HospitalRun/pouchdb,mainerror/pouchdb,daleharvey/pouchdb,nicolasbrugneaux/pouchdb,patrickgrey/pouchdb,Dashed/pouchdb,yaronyg/pouchdb,slang800/pouchdb,janl/pouchdb,Charlotteis/pouchdb,KlausTrainer/pouchdb