Tween compatible instant easing fix

Author: cocojoe

cocos2d-ui/CCBReader/CCAnimationManager.m

@@ -170,8 +170,8 @@ - (CCBSequence*)sequenceFromSequenceId:(int)seqId {
 
 - (CCActionInterval*)actionFromKeyframe0:(CCBKeyframe*)kf0 andKeyframe1:(CCBKeyframe*)kf1 propertyName:(NSString*)name node:(CCNode*)node {
     float duration = kf1.time - kf0.time;
-    
-    if(kf0.easingType==kCCBKeyframeEasingInstant) {
+
+    if(kf0 && kf0.easingType==kCCBKeyframeEasingInstant) {
         duration = 0;
     }
 
@@ -515,13 +515,13 @@ - (void)runAnimationsForSequenceId:(int)seqId tweenDuration:(float) tweenDuratio
                     }
                 }
             }
-        
+           
         }
 
 
     }
 
-    _paused = NO;
+	    _paused = NO;
 }
 
 - (void)runAnimationsForSequenceNamed:(NSString*)name tweenDuration:(float)tweenDuration {
@@ -856,8 +856,8 @@ - (CCActionSequence*)createActionForNode:(CCNode*)node sequenceProperty:(CCBSequ
             // Instant
             if(startKF.easingType==kCCBKeyframeEasingInstant) {
                 [actions addObject:[CCActionDelay actionWithDuration:endKF.time-startKF.time]];
-            }
-            
+        }
+        
             // Apply Easing
             action = [self easeAction:action easingType:startKF.easingType easingOpt:startKF.easingOpt];
             [actions addObject:action];