[vz-dev] [volkszaehler/volkszaehler.org] 840186: Fix more static analysis findings (#736)

[andig]

  Branch: refs/heads/master
  Home:   https://github.com/volkszaehler/volkszaehler.org
  Commit: 8401865b3a89ce4ad3859ff7166bd7a047b6ae3d
      https://github.com/volkszaehler/volkszaehler.org/commit/8401865b3a89ce4ad3859ff7166bd7a047b6ae3d
  Author: andig <cpuidle at gmx.de>
  Date:   2019-03-14 (Thu, 14 Mar 2019)

  Changed paths:
    M .phpstan.neon
    M lib/Server/WampClientAdapter.php
    M lib/Util/Aggregation.php
    M test/AccumulatorTest.php
    M test/Data.php
    M test/InterpreterTrait.php
    M test/Middleware.php
    M test/VirtualTest.php

  Log Message:
  -----------
  Fix more static analysis findings (#736)