fix for own error in recent scanfill updates, scanfill can hang if run on a polygon with no area.

source/blender/blenlib/intern/scanfill.c

@@ -882,7 +882,7 @@ int BLI_edgefill_ex(ScanFillContext *sf_ctx, const short do_quad_tri_speedup, co
 		}
 
 		if (UNLIKELY(normalize_v3(n) == 0.0f)) {
-			n[2] = 1.0f; /* other axis set to 0.0 */
+			return 0;
 		}
 
 		axis_dominant_v3(&co_x, &co_y, n);

source/blender/bmesh/tools/BME_bevel.c

@@ -148,7 +148,6 @@ float *BME_new_transdata_float(BME_TransData_Head *td)
  * The drawback, though, is that this code doesn't merge customdata. */
 static int BME_Bevel_Dissolve_Disk(BMesh *bm, BMVert *v)
 {
-	BMIter iter;
 	BMEdge *e, *elast;
 	BMLoop *l1, *l2;
 
@@ -156,12 +155,6 @@ static int BME_Bevel_Dissolve_Disk(BMesh *bm, BMVert *v)
 		return 0;
 	}
 
-	BM_ITER(e, &iter, bm, BM_EDGES_OF_VERT, v) {
-		if (BM_edge_face_count(e) != 2) {
-			return 0;
-		}
-	}
-
 	if (BM_vert_edge_count(v) > 2) {
 		while (BM_vert_edge_count(v) > 2) {
 			e = v->e;
@@ -1011,12 +1004,14 @@ static BMesh *BME_bevel_mesh(BMesh *bm, float value, int UNUSED(res), int option
 		}
 	}
 
+#ifdef DEBUG
 	/* Debug print, remov */
 	BM_ITER(f, &iter, bm, BM_FACES_OF_MESH, NULL) {
 		if (f->len == 2) {
-			printf("warning");
+			printf("%s: warning, 2 edge face\n", __func__);
 		}
 	}
+#endif
 
 	return bm;
 }