[Bug cli/31267] New: Bad hint when listing before reading symbols

["blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31267

            Bug ID: 31267
           Summary: Bad hint when listing before reading symbols
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: blarsen at redhat dot com
  Target Milestone: ---

If a user tries to list source lines before GDB reads the inferior's symbols,
they get the following error message:

    (gdb) list
    No symbol table is loaded.  Use the "file" command.

However, the error persists when the command is used, like so:

    (gdb) file ~/a.out                                  
    Reading symbols from ~/a.out...                     
    (No debugging symbols found in ~/a.out)             
    (gdb) list                                          
    No symbol table is loaded.  Use the "file" command. 

GDB should instead realize if the command has been used and instead tell the
user that symbols haven't been read yet (and suggest a command, eitehr 'start'
or some command to read the symbols)

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