fix: Fix pipeline element validation for collections (#3340)

diff --git a/streampipes-extensions/streampipes-sinks-internal-jvm/src/main/java/org/apache/streampipes/sinks/internal/jvm/datalake/DataLakeDimensionProvider.java b/streampipes-extensions/streampipes-sinks-internal-jvm/src/main/java/org/apache/streampipes/sinks/internal/jvm/datalake/DataLakeDimensionProvider.java
index 17ed2b9..aaa444d 100644
--- a/streampipes-extensions/streampipes-sinks-internal-jvm/src/main/java/org/apache/streampipes/sinks/internal/jvm/datalake/DataLakeDimensionProvider.java
+++ b/streampipes-extensions/streampipes-sinks-internal-jvm/src/main/java/org/apache/streampipes/sinks/internal/jvm/datalake/DataLakeDimensionProvider.java
@@ -55,10 +55,13 @@
   private void addFieldIfNotExists(EventPropertyPrimitive field,
                                    List<Option> options) {
     if (options.stream().noneMatch(o -> o.getName().equals(field.getRuntimeName()))) {
-      options.add(new Option(
-          field.getRuntimeName(),
-          PropertyScope.valueOf(field.getPropertyScope()) == PropertyScope.DIMENSION_PROPERTY)
-      );
+      if (field.getPropertyScope() != null) {
+        options.add(new Option(
+                field.getRuntimeName(),
+                PropertyScope.valueOf(field.getPropertyScope()) == PropertyScope.DIMENSION_PROPERTY
+            )
+        );
+      }
     }
   }
 
diff --git a/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/matching/v2/pipeline/CheckCompletedVisitor.java b/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/matching/v2/pipeline/CheckCompletedVisitor.java
index fadbd19..63440e7 100644
--- a/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/matching/v2/pipeline/CheckCompletedVisitor.java
+++ b/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/matching/v2/pipeline/CheckCompletedVisitor.java
@@ -21,6 +21,7 @@
 import org.apache.streampipes.model.pipeline.PipelineElementValidationInfo;
 import org.apache.streampipes.model.staticproperty.AnyStaticProperty;
 import org.apache.streampipes.model.staticproperty.CodeInputStaticProperty;
+import org.apache.streampipes.model.staticproperty.CollectionStaticProperty;
 import org.apache.streampipes.model.staticproperty.ColorPickerStaticProperty;
 import org.apache.streampipes.model.staticproperty.DefaultStaticPropertyVisitor;
 import org.apache.streampipes.model.staticproperty.FileStaticProperty;
@@ -67,6 +68,11 @@
   }
 
   @Override
+  public void visit(CollectionStaticProperty collectionStaticProperty) {
+    collectionStaticProperty.getMembers().forEach(sp -> sp.accept(this));
+  }
+
+  @Override
   public void visit(ColorPickerStaticProperty colorPickerStaticProperty) {
     validateNull(colorPickerStaticProperty, colorPickerStaticProperty.getSelectedColor());
   }
@@ -206,7 +212,7 @@
     validationInfos.add(
         PipelineElementValidationInfo.error(
             String.format(
-                "Configuration option \"%s\" as no value although it is marked as required",
+                "Configuration option \"%s\" has no value although it is marked as required",
                 sp.getInternalName()
             )
         )