removed a line which tried to add a bond which didn't exist - the molecule has 3 atoms at indices 0, 1 and 2 (there is no 3).

Change-Id: I8a54abecbba5c3e8d6a07cdefe22526b72ba3d74
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
factory call with interface

Change-Id: Ic94f3ddc4246c8302bc51f3dd16cb4d016e072cb
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>
resolved two regressions in builder3d due to null field values

Change-Id: I1c66971b48600130bce6d3b30ad9f232584421e3
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>