Remove wrong error for clocked continuous exps

See: Modelica_Synchronous.Examples.
   Elementary.RealSignals.HoldWithDAeffects2
   Elementary.RealSignals.SampleWithADeffects
   SimpleControlledDrive.ClockedWith_AD_DA_Effects
   ...

Compiler/BackEnd/SynchronousFeatures.mo

@@ -1082,14 +1082,10 @@ protected
 algorithm
   isContClockedPartition := arrayGet(inContPartitions, inPartitionIdx);
   isContClockedPartition := match isContClockedPartition
-    case NONE() then SOME(inIsContClockedPartition);
-    case SOME(isContClockedPrevPartition)
-      guard(inIsContClockedPartition == isContClockedPrevPartition)
-      then isContClockedPartition;
-    else
-      equation
-        Error.addSourceMessage(Error.CLOCKED_DSICRETE_CONT_CONFLICT, {}, source);
-      then fail();
+    case NONE() then
+      SOME(inIsContClockedPartition);
+    case SOME(isContClockedPrevPartition) then
+      SOME(inIsContClockedPartition or isContClockedPrevPartition);
   end match;
   arrayUpdate(inContPartitions, inPartitionIdx, isContClockedPartition);
 end setContClockedPartition;

Compiler/Util/Error.mo

@@ -827,8 +827,6 @@ public constant Message CLOCKED_WHEN_IN_WHEN_EQ = MESSAGE(566, TRANSLATION(), ER
   Util.gettext("Clocked when equation inside the body of when equation."));
 public constant Message CONT_CLOCKED_PARTITION_CONFLICT_EQ = MESSAGE(567, TRANSLATION(), ERROR(),
   Util.gettext("Equation belongs to clocked and continuous partitions."));
-public constant Message CLOCKED_DSICRETE_CONT_CONFLICT = MESSAGE(568, TRANSLATION(), ERROR(),
-  Util.gettext("Clocked equation contains discrete and continuous expression."));
 public constant Message INVALID_CLOCK_EQUATION = MESSAGE(569, TRANSLATION(), ERROR(),
   Util.gettext("Invalid form of clock equation"));
 public constant Message SUBCLOCK_CONFLICT = MESSAGE(570, TRANSLATION(), ERROR(),