compiling about try catch block

i write a try catch block in my java code,but i found that in some
situation the catch part will not take effect after been compiled to
javascript,and in some situation do.
i wondered why?
for example:
/////////////////////////////////////////////
try{
if(){
// do sth.
}
}
} catch (Exception e) {
// do sth2;
}
/////////////////////////////////////////////

do sth2 will not work,then i modified it to :

/////////////////////////////////////////////
try{
if(){
// do sth.
}
else{
// do another thing;
}
}
} catch (Exception e) {
// do sth2;
}
/////////////////////////////////////////////

now it works

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