Fix for a NullpointerException and Bonds with negativ yields#6

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ToralfNiebuhr wants to merge 2 commits intofrgomes:masterfrom

ToralfNiebuhr:master

Commits on Mar 14, 2016

fix, bonds can have small negativ yield. Solver still works, as the monotonicity is still true
ToralfNiebuhr
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fix NullPointerException
ToralfNiebuhr
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