added exception for debug

src/read_utils.cpp

@@ -77,12 +77,12 @@ void getDNASeqstr(FqBaseBackend* fq_files_be [],
     f_id2=fid_stored &mask_fid;
 
     unsigned long offset1=j*UINT_MAX+sr.read_a1;
-    getFqRecord(fq_files_be,f_id1,offset1,dna_seqs[0].fq_record_buf);
     try {
+        getFqRecord(fq_files_be,f_id1,offset1,dna_seqs[0].fq_record_buf);
         processFqRecord(p_dna_seqs);
     } catch (int e) {
         cout<<"j="<<j<<" sr content: a1="<<sr.read_a1<<" a2= "<<sr.read_a2<<endl;
-        cout<<"pb reading at offset1="<<offset1<<endl;
+        cout<<"pb reading/seeking at offset1="<<offset1<<endl;
         cout<<"got: "<<endl;
         cout<<dna_seqs[0].fq_record_buf<<endl;
     }
@@ -93,7 +93,7 @@ void getDNASeqstr(FqBaseBackend* fq_files_be [],
             getFqRecord(fq_files_be,f_id2,offset2,dna_seqs[1].fq_record_buf);
         } catch (int e) {
             cout<<"j="<<j<<" sr content: a1="<<sr.read_a1<<" a2= "<<sr.read_a2<<endl;
-            cout<<"pb reading at offset2="<<offset2<<endl;
+            cout<<"pb reading/seeking at offset2="<<offset2<<endl;
             cout<<"got: "<<endl;
             cout<<dna_seqs[1].fq_record_buf<<endl;
         }