systemd syntax check fails with "\"

Issue

After the update of systemd on the version 219-57 error messages are generated for service files which use a \ for line break:

Example:

# cat /etc/systemd/system/nscale-webdav.service
[...]
ExecStart=/var/ceyoniq/nscale-webdav/jre/bin/java \
          -Xms24M -Xmx256M -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=20 \
          -cp /var/ceyoniq/nscale-webdav/lib/* 
[...]

When starting gives:

 systemd[1]: [/etc/systemd/system/nscale-webdav.service:30] Trailing garbage, ignoring.
 systemd[1]: [/etc/systemd/system/nscale-webdav.service:31] Unknown lvalue '-Xms24M -Xmx256M -XX:MinHeapFreeRatio' in section 'Service'
 systemd[1]: [/etc/systemd/system/nscale-webdav.service:32] Missing '='.