- bug fix #1843

https://projects.blender.org/tracker/index.php?func=detail&aid=1843&group_id=9&atid=125

  function find_basis_mball() sometimes returned duplicated MetaBall as basis mball, which caused crash of Blender. It happened only when basis MBall object was used for duplication. It was propably caused by some changes in duplicator code.

source/blender/blenkernel/intern/mball.c

@@ -329,8 +329,10 @@ Object *find_basis_mball(Object *basis)
 					else ml= ((MetaBall*)ob->data)->elems.first;
 					
 					if(obnr<basisnr){
-						basis= ob;
-						basisnr= obnr;
+						if(!(ob->flag & OB_FROMDUPLI)){
+							basis= ob;
+							basisnr= obnr;
+						}
 					}	
 				}
 			}