Check for a file before running

I have a script below that moves a file from one directory to another based on the file age. The script then compresses the file and removes the .pdf from the directory. The problem I am having is that the if there is no .pdf to move it searches some local directories and tries to remove files if a .pdf is not old enough. What I would like to do is check and see if there is a file to move. If there is then proceed. If not end the script.
#Mailstream/CASSRPT & COMPRESSION SCRIPT

#move the files to Archive
$date = (get-date).AddDays(-5)
get-childitem \\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\*.pdf | where-object {$_.LastWriteTime -lt $date} |
move-item -Destination \\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive -force

# Alias for 7-zip 
if (-not (test-path "$env\\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive\7-zip")) {throw "$env\\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive\7-Zip\7z.exe needed"} 
set-alias sz "$env\\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive\7-Zip\7z.exe" 

#### Variables 
$filePath = "\\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive" 
$pdf = Get-ChildItem -Recurse -Path $filePath | Where-Object { $_.Extension -eq ".pdf" } 
########### END of VARABLES 
foreach ($file in $pdf) { 
                    $name = $file.name 
                    $directory = $file.DirectoryName 
                    $zipfile = $name.Replace(".pdf",".zip") 
                    sz a -tzip "$directory\$zipfile" "$directory\$name"
                    }
Remove-item \\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\Archive\*.pdf* -force


$date = (get-date).AddDays(-366)
get-childitem \\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\COMPRESSION_TESTING\*.zip | where-object {$_.LastWriteTime -lt $date} |
Remove-item \\jcc.jccsystems.com\omafiles\SPC-ProductionDatabases\Mailstream\COMPRESSION_TESTING\Archive -force

#$doirunit = (Get-ChildItem "\\csg.csgsystems.com\omafiles\SPC-ProductionDatabases\Mailstream").Count 
#    if ($doirunit -ge 0)  {exit}