Apply patch from datev-loon-staging-20213

This patch fixes null pointer exceptions in the build which led to null
pointer exceptions.

Author: HeikoBecker

code/languages/org.iets3.opensource/solutions/org.iets3.core.expr.plugin/models/plugin.mps

@@ -7959,6 +7959,19 @@
             </node>
           </node>
         </node>
+        <node concept="3clFbJ" id="bMl_QAQahX" role="3cqZAp">
+          <node concept="3clFbS" id="bMl_QAQahZ" role="3clFbx">
+            <node concept="3cpWs6" id="bMl_QAQjqB" role="3cqZAp">
+              <node concept="3clFbT" id="bMl_QAQzzo" role="3cqZAk" />
+            </node>
+          </node>
+          <node concept="3clFbC" id="bMl_QAQe13" role="3clFbw">
+            <node concept="10Nm6u" id="bMl_QAQgXJ" role="3uHU7w" />
+            <node concept="37vLTw" id="bMl_QAQcHE" role="3uHU7B">
+              <ref role="3cqZAo" node="57VdFqPmBm_" resolve="mpsproj" />
+            </node>
+          </node>
+        </node>
         <node concept="3clFbF" id="6pNCASbIzik" role="3cqZAp">
           <node concept="2OqwBi" id="6pNCASbI_ic" role="3clFbG">
             <node concept="2OqwBi" id="6pNCASbI$Ic" role="2Oq$k0">
@@ -8094,6 +8107,17 @@
             </node>
           </node>
         </node>
+        <node concept="3clFbJ" id="bMl_QAQAAn" role="3cqZAp">
+          <node concept="3clFbS" id="bMl_QAQAAp" role="3clFbx">
+            <node concept="3cpWs6" id="bMl_QAQI6T" role="3cqZAp" />
+          </node>
+          <node concept="3clFbC" id="bMl_QAQEjq" role="3clFbw">
+            <node concept="10Nm6u" id="bMl_QAQFVO" role="3uHU7w" />
+            <node concept="37vLTw" id="bMl_QAQCZF" role="3uHU7B">
+              <ref role="3cqZAo" node="57VdFqPmRnB" resolve="mpsproj" />
+            </node>
+          </node>
+        </node>
         <node concept="3clFbF" id="6pNCASbIHtm" role="3cqZAp">
           <node concept="2OqwBi" id="6pNCASbIHtn" role="3clFbG">
             <node concept="2OqwBi" id="6pNCASbIHto" role="2Oq$k0">
@@ -8242,6 +8266,19 @@
             </node>
           </node>
         </node>
+        <node concept="3clFbJ" id="1BcQI8sytfV" role="3cqZAp">
+          <node concept="3clFbS" id="1BcQI8sytfW" role="3clFbx">
+            <node concept="3cpWs6" id="1BcQI8sytfX" role="3cqZAp">
+              <node concept="3clFbT" id="1BcQI8sytfY" role="3cqZAk" />
+            </node>
+          </node>
+          <node concept="3clFbC" id="1BcQI8sytfZ" role="3clFbw">
+            <node concept="10Nm6u" id="1BcQI8sytg0" role="3uHU7w" />
+            <node concept="37vLTw" id="1BcQI8sytg1" role="3uHU7B">
+              <ref role="3cqZAo" node="5MbB62qyUu$" resolve="mpsproj" />
+            </node>
+          </node>
+        </node>
         <node concept="3clFbF" id="6pNCASbIIig" role="3cqZAp">
           <node concept="2OqwBi" id="6pNCASbIIih" role="3clFbG">
             <node concept="2OqwBi" id="6pNCASbIIii" role="2Oq$k0">