Fix #3064

Assigning a Hook in Mesh editmode to new created vertices crashed on
exit editmode.

source/blender/src/editmesh.c

@@ -1100,12 +1100,15 @@ void load_editMesh(void)
 						}
 						
 						for (i=j=0; i<hmd->totindex; i++) {
+							if(hmd->indexar[i] < ototvert) {
 								eve = vertMap[hmd->indexar[i]];
 								
 								if (eve) {
 									hmd->indexar[j++] = (long) eve->vn;
 								}
 							}
+							else j++;
+						}
 
 						hmd->totindex = j;
 					}