Suppress ontology loading errors in the OWLAPI Driver. When the ontol…

…ogy file does not exist, it is not necessary to display stacktrace.

ontodriver-owlapi/src/main/java/cz/cvut/kbss/ontodriver/owlapi/connector/BasicStorageConnector.java

@@ -31,6 +31,7 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.FileNotFoundException;
 import java.util.List;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -83,7 +84,11 @@ protected void initializeConnector() throws OwlapiDriverException {
                                 " but the loaded ontology has IRI " + ontology.getOntologyID().getOntologyIRI());
             }
         } catch (OWLOntologyCreationException e) {
-            LOG.trace("Unable to load ontology from document.", e);
+            if (e.getCause() instanceof FileNotFoundException) {
+                LOG.trace("Ontology file {} does not exist.", storageProperties.getPhysicalURI());
+            } else {
+                LOG.trace("Unable to load ontology from document.", e);
+            }
             tryCreatingOntology();
         }
         initializeReasonerFactory();