Rules fetch contact entity by e-mail

I'd like to review this patch. It would be helpful if you could had a moment to shoot us a quick Rules export that leverages this code.

In my use case, i import mails via mailhandler, and connect the imported Mails with my redhen contacts.
If there is no contact i'd like to create one.
The patch in #2 is working, but without an existing Mail address, there is an error message:
Warning: array_shift() expects parameter 1 to be array, boolean given in redhen_contact_rules_action_fetch_by_mail()

My rule is:
{ "rules_mail_import" : {
"LABEL" : "mail import",
"PLUGIN" : "reaction rule",
"REQUIRES" : [ "rules", "redhen_contact", "rules_conditional", "feeds" ],
"ON" : { "feeds_import_mail_importer" : [] },
"IF" : [
{ "node_is_of_type" : { "node" : [ "node" ], "type" : { "value" : { "mails" : "mails" } } } }
],
"DO" : [
{ "fetch_contact_by_mail" : {
"USING" : { "mail" : [ "node:field-mail-from-address" ] },
"PROVIDE" : { "fetched_contact" : { "fetched_contact" : "Fetched contact" } }
}
},
{ "CONDITIONAL" : [
{
"IF" : { "entity_is_of_bundle" : {
"entity" : [ "fetched-contact" ],
"type" : "redhen_contact",
"bundle" : { "value" : { "kontakte" : "kontakte" } }
}
},
"DO" : [
{ "data_set" : { "data" : [ "node:field-contact-ref" ], "value" : [ "fetched-contact" ] } },
{ "entity_save" : { "data" : [ "node" ], "immediate" : 1 } }
]
}
]
}
]
}
}

thanks for help

Your patch works great, thank you

Thanks @philipz!