Issue 234: useless reindexing of empty files

$ ll /home/rz/00038-150555-08122014.ogg -rw-r—r--. 1 rz rz 0 Dec 8 15:05 /home/rz/00038-150555-08122014.ogg

— has been seen before by recoll --

:4:../internfile/internfile.cpp:161:FileInterner::init fn [/home/rz/00038-150555-08122014.ogg] mime [(null)] preview 0 :4:../internfile/mimehandler.cpp:249:getMimeHandler: mtype [application/ogg] filtertypes 1 :4:../internfile/mimehandler.cpp:64:getMimeHandlerFromCache: 148e941113667c071ca8f2e5a79f6a20 cache size 4 :4:../internfile/mimehandler.cpp:77:getMimeHandlerFromCache: 148e941113667c071ca8f2e5a79f6a20 found size 3 :4:../internfile/internfile.cpp:248:FileInterner:: init ok application/ogg [/home/rz/00038-150555-08122014.ogg] :4:../internfile/internfile.cpp:737:FileInterner::internfile. ipath [] :4:../internfile/mh_execm.cpp:152:MimeHandlerExecMultiple::next_document(): [/home/rz/00038-150555-08122014.ogg] :4:../internfile/mh_execm.cpp:157:MHExecMultiple::next_document(): helper known missing :2:../internfile/internfile.cpp:732:FileInterner::internfile: next_document error [/home/rz/00038-150555-08122014.ogg] application/ogg :4:../internfile/mimehandler.cpp:98:returnMimeHandler: returning filter for application/ogg cache size 3 :4:../internfile/internfile.cpp:852:FileInterner::internfile: conversion ended with no doc :4:../rcldb/rcldb.cpp:1249:Db::add: udi [/home/rz/00038-150555-08122014.ogg|] parent [] :3:../rcldb/rcldb.cpp:604:Db::add: docid 7714 updated [/home/rz/00038-150555-08122014.ogg|]

Recoll retries indexing errors at each pass. We could special-case empty files, but, really, how much of a real-world issue is this ?

Duplicate of #232.

New code does special-case empty files.