[bugfix] Address further code-review issues found by Patrick Reinhart

Author: adamretter

exist-core/src/main/java/org/exist/xquery/RangeSequence.java

@@ -223,6 +223,7 @@ public boolean contains(final Item item) {
                 return other.compareTo(start.toJavaObject(BigInteger.class)) >= 0
                         && other.compareTo(end.toJavaObject(BigInteger.class)) <= 0;
             } catch (final XPathException e) {
+                LOG.warn(e.getMessage(), e);
                 return false;
             }
         }

exist-core/src/main/java/org/exist/xquery/value/SubSequence.java

@@ -450,6 +450,7 @@ public boolean containsReference(final Item item) {
             }
             return false;
         } catch (final XPathException e) {
+            LOG.warn(e.getMessage(), e);
             return false;
         }
     }
@@ -465,6 +466,7 @@ public boolean contains(final Item item) {
             }
             return false;
         } catch (final XPathException e) {
+            LOG.warn(e.getMessage(), e);
             return false;
         }
     }