Show appropriate warning if non-existent export ID is specified

Fixed bug:
  - https://bugs.launchpad.net/inkscape/+bug/1739497

3 files changed, 10 insertions, 1 deletions

diff --git a/src/extension/internal/cairo-ps-out.cpp b/src/extension/internal/cairo-ps-out.cpp
index e8f47e79e..57169ed45 100644
--- a/src/extension/internal/cairo-ps-out.cpp
+++ b/src/extension/internal/cairo-ps-out.cpp
@@ -76,6 +76,9 @@ ps_print_document_to_file(SPDocument *doc, gchar const *filename, unsigned int l
     if (exportId && strcmp(exportId, "")) {
         // we want to export the given item only
         base = SP_ITEM(doc->getObjectById(exportId));
+        if (!base) {
+            throw Inkscape::Extension::Output::export_id_not_found(exportId);
+        }
         pageBoundingBox = exportCanvas;
     }
     else {
diff --git a/src/extension/internal/cairo-renderer-pdf-out.cpp b/src/extension/internal/cairo-renderer-pdf-out.cpp
index 5576676b2..865de1a07 100644
--- a/src/extension/internal/cairo-renderer-pdf-out.cpp
+++ b/src/extension/internal/cairo-renderer-pdf-out.cpp
@@ -71,6 +71,9 @@ pdf_render_document_to_file(SPDocument *doc, gchar const *filename, unsigned int
     if (exportId && strcmp(exportId, "")) {
         // we want to export the given item only
         base = SP_ITEM(doc->getObjectById(exportId));
+        if (!base) {
+            throw Inkscape::Extension::Output::export_id_not_found(exportId);
+        }
         pageBoundingBox = exportCanvas;
     }
     else {
diff --git a/src/extension/internal/latex-text-renderer.cpp b/src/extension/internal/latex-text-renderer.cpp
index 7a1cacbf2..960aec7a9 100644
--- a/src/extension/internal/latex-text-renderer.cpp
+++ b/src/extension/internal/latex-text-renderer.cpp
@@ -41,6 +41,7 @@
 
 #include "util/units.h"
 
+#include "extension/output.h"
 #include "extension/system.h"
 
 #include "inkscape-version.h"
@@ -68,7 +69,9 @@ latex_render_document_text_to_file( SPDocument *doc, gchar const *filename,
     if (exportId && strcmp(exportId, "")) {
         // we want to export the given item only
         base = dynamic_cast<SPItem *>(doc->getObjectById(exportId));
-        g_assert(base != NULL);
+        if (!base) {
+            throw Inkscape::Extension::Output::export_id_not_found(exportId);
+        }
         pageBoundingBox = exportCanvas;
     }
     else {