Prevent NPE in ApiBaseline.getApiComponent(String, Version)

- Guard against fAllComponentsById.get(id) yielding null.

#1569

Author: merks

apitools/org.eclipse.pde.api.tools/src/org/eclipse/pde/api/tools/internal/model/ApiBaseline.java

@@ -674,6 +674,9 @@ public IApiComponent getApiComponent(String id, Version version) {
 			return component;
 		}
 		Set<IApiComponent> allComponents = fAllComponentsById.get(id);
+		if (allComponents == null) {
+			return null;
+		}
 		return allComponents.stream().filter(c -> hasSameMMMVersion(version, c)).findFirst().orElse(null);
 	}