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fix bugs when function with no args in css #5
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// given a style like this: filter:mask
// when a function with no args, the array arg will be null, the call stack blows:
```void katana_destroy_function(KatanaParser* parser, KatanaValueFunction* e) x
katana_destroy_array(parser, katana_destroy_value, e->args); ```
using gdb to show arg e :
```(gdb) p *e
$42 = {name = 0x84c140 "mask(", args = 0x0}```
remove assert on NULL != array
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when a css code like this:
filter:mask(), the function mask has no args, then the'array' arg will be null in function 'katana_destroy_array_using_deallocator'