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OGCGeometry#contains, intersects, disjoint and distance fail with NPE on geometry collections

See original GitHub issue

All of the relationship test APIs fail with NPE when input is a geometry collection.

Here are some examples:

@Test
public void testDisjointOnGeometryCollection()
{
  OGCGeometry ogcGeometry = OGCGeometry.fromText("GEOMETRYCOLLECTION (POINT (1 1))");
  ogcGeometry.disjoint(OGCGeometry.fromText("POINT (1 1)"));
}

@Test
public void testContainsOnGeometryCollection()
{
  OGCGeometry ogcGeometry = OGCGeometry.fromText("GEOMETRYCOLLECTION (POINT (1 1))");
  ogcGeometry.contains(OGCGeometry.fromText("POINT (1 1)"));
}

@Test
public void testIntersectsOnGeometryCollection()
{
  OGCGeometry ogcGeometry = OGCGeometry.fromText("GEOMETRYCOLLECTION (POINT (1 1))");
  ogcGeometry.contains(OGCGeometry.fromText("POINT (1 1)"));
}

@Test
public void testDistanceOnGeometryCollection()
{
  OGCGeometry ogcGeometry = OGCGeometry.fromText("GEOMETRYCOLLECTION (POINT (1 1))");
  ogcGeometry.distance(OGCGeometry.fromText("POINT (1 1)"));
}

and exceptions:

java.lang.NullPointerException
  at com.esri.core.geometry.RelationalOperations.relate(RelationalOperations.java:44)
  at com.esri.core.geometry.OperatorDisjointLocal.execute(OperatorDisjointLocal.java:31)
  at com.esri.core.geometry.GeometryEngine.disjoint(GeometryEngine.java:376)
  at com.esri.core.geometry.ogc.OGCGeometry.disjoint(OGCGeometry.java:275)
  at com.esri.core.geometry.TestOGC.testDisjointOnGeometryCollection(TestOGC.java:290)

java.lang.NullPointerException
  at com.esri.core.geometry.RelationalOperations.relate(RelationalOperations.java:44)
  at com.esri.core.geometry.OperatorContainsLocal.execute(OperatorContainsLocal.java:31)
  at com.esri.core.geometry.GeometryEngine.contains(GeometryEngine.java:479)
  at com.esri.core.geometry.ogc.OGCGeometry.contains(OGCGeometry.java:307)
  at com.esri.core.geometry.TestOGC.testContainsOnGeometryCollection(TestOGC.java:297)

java.lang.NullPointerException
  at com.esri.core.geometry.RelationalOperations.relate(RelationalOperations.java:44)
  at com.esri.core.geometry.OperatorContainsLocal.execute(OperatorContainsLocal.java:31)
  at com.esri.core.geometry.GeometryEngine.contains(GeometryEngine.java:479)
  at com.esri.core.geometry.ogc.OGCGeometry.contains(OGCGeometry.java:307)
  at com.esri.core.geometry.TestOGC.testIntersectsOnGeometryCollection(TestOGC.java:304)     

java.lang.IllegalArgumentException
  at com.esri.core.geometry.OperatorDistanceLocal.execute(OperatorDistanceLocal.java:38)
  at com.esri.core.geometry.GeometryEngine.distance(GeometryEngine.java:592)
  at com.esri.core.geometry.ogc.OGCGeometry.distance(OGCGeometry.java:333)
  at com.esri.core.geometry.TestOGC.testDistanceOnGeometryCollection(TestOGC.java:311)