[Bug]: ctType contains extra empty classes.

### Describe the bug

I import static member variables in the constant class to the current Java file. If Constants.java is not in the parsing path, the generated ctType contains an empty Constants.java. If the Constants.java is in the current parsing path, the actual class is overwritten by an empty Constants.java.

Only the ConfigQueryRequestHandlerTest.java file exists in the current project. The Constants.java file is in another project.

### Source code you are trying to analyze/transform

```Java
import org.apache.commons.io.FileUtils;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockedStatic;
import org.mockito.Mockito;
import org.mockito.junit.MockitoJUnitRunner;

import java.io.File;

import static p13.Constants.ENCODE;

@RunWith(MockitoJUnitRunner.class)
public class ConfigQueryRequestHandlerTest {
@Mock
private File file;

@Test
public void testHandle() {
final MockedStatic fileUtilsMockedStatic = Mockito.mockStatic(FileUtils.class);
fileUtilsMockedStatic.when(() -> FileUtils.readFileToString(file, ENCODE)).thenReturn("content");
}
}
```

### Source code for your Spoon processing

```Java
Launcher launcher = new Launcher();
launcher.getEnvironment().setComplianceLevel(11);
launcher.getEnvironment().setAutoImports(true);
launcher.getEnvironment().setIgnoreDuplicateDeclarations(true);
launcher.addInputResource("D:\\git-code\\test");
CtModel model = launcher.buildModel();
Collection> allTypes = model.getAllTypes();
System.out.println(allTypes.size());
for (CtType ctType : allTypes) {
System.out.println(ctType.getSimpleName());
}
```

### Actual output

```Java
2
ConfigQueryRequestHandlerTest
Constants
```

### Expected output

```Java
1
ConfigQueryRequestHandlerTest
```

### Spoon Version

10.3.0

### JVM Version

11

### What operating system are you using?

win10