D28126: Fix crash, the e-mail client service can be null

[Aleix Pol Gonzalez]

apol created this revision.
apol added a reviewer: meven.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
apol requested review of this revision.

TEST PLAN
  I don't get a crash anymore

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28126

AFFECTED FILES
  kcms/componentchooser/componentchooseremail.cpp

To: apol, meven
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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