JobScheduler cannot send email.

Current Situation
When sending email on success or on error in scheduler.log appears
SCHEDULER-302 Error sending e-mail: Z-JAVA-105 Java exception javax.mail.internet.AddressException("Empty address"), method=set [from="Job Scheduler scheduler _id an ur:4444" <>]

Workaround
Please comment or delete the attribute from_name in the ./config/scheduler_mail.xsl
...
<xsl:copy-of select="mail/header/@from_address" />

<!--xsl:if test="$lang='de'">
<xsl:attribute name="from_name">JobScheduler <xsl:value-of select="/scheduler_event/state/@spooler_id"/> an <xsl:value-of select="/scheduler_event/state/@host"/>:<xsl:value-of select="/scheduler_event/state/@tcp_port"/>
</xsl:attribute>
</xsl:if>
<xsl:if test="$lang='en'">
<xsl:attribute name="from_name">JobScheduler <xsl:value-of select="/scheduler_event/state/@spooler_id"/> at <xsl:value-of select="/scheduler_event/state/@host"/>:<xsl:value-of select="/scheduler_event/state/@tcp_port"/>
</xsl:attribute>
</xsl:if-->

<xsl:copy-of select="mail/header/@to" />
<xsl:copy-of select="mail/header/@cc" />
<xsl:copy-of select="mail/header/@bcc" />
...