Do not create empty vertices during GFA load until needed #129

Job	Run time
🚧 Build SPAdes	1m 36s
Multicell B.cereus TruSeq 100x	4m 21s
Full run M.ruber JGI lane 9	5m 57s
IonTorrent E.coli K12	30m 4s
Mate-pairs B.faecium	7m 22s
metaSPAdes JGI 150	15m 28s
Contigs E.coli JGI lane 7	4m 27s
metaviralSPAdes ERR525599	15m 53s
Nextera L.monocytogenes	1m 7s
PacBio M.ruber	9m 26s
plasmidSPAdes C.callunae	7m 32s
Saves E.coli 100K	45s
Saves E.coli UCSD lane 1	9m 23s
Single-cell P.heparinus JGI lane 7	7m 35s
Single reads E.coli Deeptrench	6m 44s
	2h 7m 40s

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