Find ChEBI entries that cannot be saved to CML

# process.groovy
# tested with CDK 1.2.3

import org.openscience.cdk.interfaces.*;
import org.openscience.cdk.io.*;
import org.openscience.cdk.io.iterator.*;
import org.openscience.cdk.*;
import org.openscience.cdk.tools.manipulator.*;

iterator = new IteratingMDLReader(
  new File("ChEBI_complete.sdf").newReader(),
  DefaultChemObjectBuilder.getInstance()
)
i = 0
iterator.each { mol ->
  i++
  cml = new StringWriter();
  cmlWriter = new CMLWriter(cml);
  try {
    cmlWriter.write(mol);
    cmlStr = cml.toString();
  } catch (Exception exception) {
    println "\nFailed to convert to CML: " + mol.getProperty("ChEBI ID");
  }
  if (i == 50) {
    print ".";
    i = 0
  }
}