cdm/src/main/java/ucar/nc2/AttributeContainerHelper.java
@Override
  public boolean removeAttribute(String attName) {
    Attribute att = findAttribute(attName);
    return att != null && atts.remove(att);
  }
@Override
  public boolean removeAttribute(String attName) {
    Attribute att = findAttribute(attName);
    return att != null && atts.remove(att);
  }
Remove an Attribute by name.

@param attName if exists, remove this attribute
@return true if was found and removed