Source: The Great Interpretation of Dreams (Ibn Sirin)
An empty grave may indicate a prison without a prisoner, or a worry that will disappear, or a matter that will not be completed.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
An empty grave may indicate an empty house or a marriage that will not happen.
Source: Signs in the Science of Expressions (Ibn Shaheen)
An empty grave is interpreted as worry that dissipates or false hope.