Unused imports removed

de.hftstuttgart.cityunits.model/src/de/hftstuttgart/cityunits/model/NullableQuantity.java

@@ -4,17 +4,11 @@ import java.text.NumberFormat;
 import java.text.ParseException;
 import java.util.Locale;
 import java.util.Optional;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 import javax.measure.Quantity;
 import javax.measure.Unit;
 
-import org.eclipse.core.runtime.ILog;
 import org.eclipse.core.runtime.Platform;
-import org.osgi.framework.Bundle;
-import org.osgi.framework.FrameworkUtil;
-import org.eclipse.core.runtime.Status;
 
 import tech.units.indriya.format.SimpleQuantityFormat;
 import tech.units.indriya.quantity.Quantities;