Dealing with empty query

[lpatiny]

When loading a substructure search page:

http://www.cheminfo.org/flavor/malaria/Utilities/Substructure_search.html

It would be nice to display by default all the molecules. However there is a problem is that JSME gives an empty string instead of an empty molfile when nothing is drawn.

The library could take into account that if:

• the molfile is empty
• the molecule resulting of the molfile contains 0 atoms and 0 bonds
  All the molecules are displayed not taking into account the search criteria