HUE-4809 [oozie] Only add trustore paths when they are actually existing
HUE-4809 [oozie] Only add trustore paths when they are actually existing

Note: this does not fix the issue when they are needed, but make the error
message clearer by not hiding the root cause.

cloudera/hue,xq262144/hue,cloudera/hue,kawamon/hue,kawamon/hue,cloudera/hue,kawamon/hue,cloudera/hue,todaychi/hue,todaychi/hue,kawamon/hue,jayceyxc/hue,cloudera/hue,xq262144/hue,cloudera/hue,cloudera/hue,kawamon/hue,kawamon/hue,xq262144/hue,cloudera/hue,todaychi/hue,cloudera/hue,xq262144/hue,cloudera/hue,cloudera/hue,kawamon/hue,cloudera/hue,kawamon/hue,todaychi/hue,jayceyxc/hue,kawamon/hue,xq262144/hue,kawamon/hue,xq262144/hue,kawamon/hue,cloudera/hue,todaychi/hue,kawamon/hue,kawamon/hue,kawamon/hue,jayceyxc/hue,todaychi/hue,kawamon/hue,jayceyxc/hue,jayceyxc/hue,jayceyxc/hue,cloudera/hue,todaychi/hue,jayceyxc/hue,xq262144/hue,xq262144/hue,cloudera/hue,cloudera/hue,jayceyxc/hue,kawamon/hue,todaychi/hue,xq262144/hue,todaychi/hue,kawamon/hue,cloudera/hue,kawamon/hue,jayceyxc/hue,cloudera/hue