In LibreOffice Basic, how can I stop my macro crashing when a control is absent?

In a previous post I presented macro code to capture the contents of a text frame. I am trying to add error processing, the aim is to fail silently if anything is missing.

I now have this code fragment:

On Error GoTo End
try:
    
    oFrame = document.TextFrames
    if IsError(oFrame) or isNull(oFrame) then exit sub

    oField = oFrame.getByName("xxDocTitle") ‘ Exception here
    
    if IsError(oField) then exit sub
    if isNull(oField) or isNull(oField.String) or oField.String = "" then exit sub
    filename = oField.String & ".odt" 
Catch:
    ' Exit silently
end sub

it works if the text frame is empty but always produces an error dialogue if the frame is absent:

An exception occurred

Type: com.sun.star.container.NoSuchElementException

Message:.

Can I do anything to suppress the exception message?

In LibreOffice Basic, exception handling is done with an On Error GoTo code block, possibly with Resume.

The following is an outline, rather than actual working script; you'll need to modify it for your purposes. Note that Resume might not be used.

Sub ExampleSetFilename
On Error GoTo MyErrorHandler  ' This looks for a specific label
    oFrame = document.TextFrames
    oField = oFrame.getByName("xxDocTitle") ‘ Error might occur here    
    filename = oField.String & ".odt" 
    exit sub
MyErrorHandler: ` Label for location to go on error
    MsgBox "Oops... there was an error, which was ignored.",  0,  "Error"
    Resume Next ` continue in code block where error occurred, e.g., inside loop
End Sub