[FIX] transition: no crash if added/removed quickly

This commit should fix crashes coming from transition code on nodes.
This does not impact transitions on components.

closes #637
closes #641

tests/__snapshots__/animations.test.ts.snap

@@ -177,3 +177,24 @@ exports[`animations t-transition, on a simple node (insert) 1`] = `
     return vn1;
 }"
 `;
+
+exports[`animations t-transition, on a simple node, not in the DOM 1`] = `
+"function anonymous(context, extra
+) {
+    // Template name: \\"test\\"
+    let utils = this.constructor.utils;
+    let h = this.h;
+    let c1 = [], p1 = {key:1};
+    let vn1 = h('span', p1, c1);
+    p1.hook = {
+      insert: vn => {
+        utils.transitionInsert(vn, 'chimay');
+      },
+      remove: (vn, rm) => {
+        utils.transitionRemove(vn, 'chimay', rm);
+      },
+    };
+    c1.push({text: \`blue\`});
+    return vn1;
+}"
+`;