Added panicked attribute to context.go

This attribute is set to false during initalisation, and it's set to
true when error arises.

cmd/context.go

@@ -24,6 +24,7 @@ import (
 type AptlyContext struct {
 	flags        *flag.FlagSet
 	configLoaded bool
+	panicked     bool
 
 	progress          aptly.Progress
 	downloader        aptly.Downloader
@@ -58,6 +59,7 @@ func Fatal(err error) {
 	if err == commander.ErrFlagError || err == commander.ErrCommandError {
 		returnCode = 2
 	}
+	context.panicked = true
 	panic(&FatalError{ReturnCode: returnCode, Message: err.Error()})
 }
 
@@ -273,6 +275,7 @@ func InitContext(flags *flag.FlagSet) error {
 
 	context = &AptlyContext{
 		flags:             flags,
+		panicked:          false,
 		dependencyOptions: -1,
 		publishedStorages: map[string]aptly.PublishedStorage{},
 	}