MgPropertyDefinitionCollection:: Remove(MgPropertyDefinition) returns a wrong value when the collection is empty

[jiab]

Step to recur:

1. Construct an instance of MgPropertyDefinitionCollection using the following code MgPropertyDefinitionCollection propDefColl = new MgPropertyDefinitionCollection();
2. Construct an instance of MgPropertyDefinition using the following code

MgPropertyDefinition propDef = new MgPropertyDefinition("propName", MgPropertyType.Boolean);

3. Use the method Remove(MgPropertyDefinition value)to return a bool type value.

Sample code:

Assert.IsFalse(propDefColl.Remove(propDef));

Expect result: False Actual result: True

[trevorwekel]

Patch submitted by Jessica Cao

​http://trac.osgeo.org/mapguide/changeset/2696