fix(outputters): Don't attempt to create output if we error before pr…

…ocessing even starts

core/utilities/init.lua

@@ -332,7 +332,7 @@ function utilities.error (message, isbug)
    utilities.warn(message, isbug)
    _skip_traceback_levels = 2
    io.stderr:flush()
-   SILE.outputter:finish() -- Only really useful from the REPL but no harm in trying
+   SILE.outputter:finish()
    SILE.scratch.caughterror = true
    error("", 2)
 end

outputters/libtexpdf.lua

@@ -68,12 +68,13 @@ end
 function outputter._endHook (_) end
 
 function outputter:finish ()
-   self:_ensureInit()
-   pdf.endpage()
-   self:runHooks("prefinish")
-   pdf.finish()
-   started = false
-   lastkey = nil
+   if started then
+      pdf.endpage()
+      self:runHooks("prefinish")
+      pdf.finish()
+      started = false
+      lastkey = nil
+   end
 end
 
 function outputter.getCursor (_)