fixed swallowed exception in query result conversion (#213)

Author: rashtao

ChangeLog.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 
 ## [Unreleased]
 
+- fixed swallowed exception in query result conversion (#213)
+
 ## [3.3.0] - 2020-08-14
 
 ### Added

src/main/java/com/arangodb/springframework/repository/query/ArangoResultConverter.java

@@ -40,6 +40,7 @@
 import org.springframework.data.geo.GeoResult;
 import org.springframework.data.geo.GeoResults;
 import org.springframework.data.geo.Metrics;
+import org.springframework.data.mapping.MappingException;
 import org.springframework.util.Assert;
 
 import com.arangodb.ArangoCursor;
@@ -121,8 +122,7 @@ public Object convertResult(final Class<?> type) {
 			}
 			return TYPE_MAP.get(type).invoke(this);
 		} catch (final Exception e) {
-			e.printStackTrace();
-			return null;
+			throw new MappingException(String.format("Can't convert result to type %s!", type.getName()), e);
 		}
 	}