[balsa] Various: Check for NULL GtkTreePath

[Peter Bloomfield <peterb src gnome org>]

commit 3ca4acf0883b7adc22d62b8059cf6a22eb980b85
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sun Aug 30 14:53:05 2020 -0400

    Various: Check for NULL GtkTreePath
    
    Check the path returned by gtk_tree_row_reference_get_path(), as it can
    be NULL.
    
    modified:   libbalsa/address-view.c
    modified:   src/balsa-index.c

 libbalsa/address-view.c | 20 +++++++++++++-------
 src/balsa-index.c       | 12 ++++++++----
 2 files changed, 21 insertions(+), 11 deletions(-)
---
diff --git a/libbalsa/address-view.c b/libbalsa/address-view.c
index 5a27c4dd1..817b34617 100644
--- a/libbalsa/address-view.c
+++ b/libbalsa/address-view.c
@@ -271,10 +271,12 @@ lbav_ensure_blank_line_idle_cb(LibBalsaAddressView * address_view)
     gtk_tree_row_reference_free(address_view->focus_row);
     address_view->focus_row = NULL;
 
-    /* This will open the entry for editing */
-    gtk_tree_view_set_cursor(GTK_TREE_VIEW(address_view), focus_path,
-                             address_view->focus_column, TRUE);
-    gtk_tree_path_free(focus_path);
+    if (focus_path != NULL) {
+        /* This will open the entry for editing */
+        gtk_tree_view_set_cursor(GTK_TREE_VIEW(address_view), focus_path,
+                                 address_view->focus_column, TRUE);
+        gtk_tree_path_free(focus_path);
+    }
 
     address_view->focus_idle_id = 0;
 
@@ -1160,14 +1162,18 @@ libbalsa_address_view_add_to_row(LibBalsaAddressView * address_view,
     GtkTreePath *path;
     GtkTreeIter iter;
     guint type;
-    gboolean valid;
+    gboolean valid = FALSE;
 
     g_return_if_fail(LIBBALSA_IS_ADDRESS_VIEW(address_view));
 
     model = gtk_tree_view_get_model(GTK_TREE_VIEW(address_view));
+
     path = gtk_tree_row_reference_get_path(row_ref);
-    valid = gtk_tree_model_get_iter(model, &iter, path);
-    gtk_tree_path_free(path);
+    if (path != NULL) {
+        valid = gtk_tree_model_get_iter(model, &iter, path);
+        gtk_tree_path_free(path);
+    }
+
     if (!valid)
         return;
 
diff --git a/src/balsa-index.c b/src/balsa-index.c
index 41fbdff28..bf435ef9d 100644
--- a/src/balsa-index.c
+++ b/src/balsa-index.c
@@ -865,8 +865,10 @@ bndx_scroll_to_row_idle(gpointer user_data)
     gtk_tree_row_reference_free(bindex->reference);
     bindex->reference = NULL;
 
-    gtk_tree_view_scroll_to_cell(tree_view, path, NULL, FALSE, 0, 0);
-    gtk_tree_path_free(path);
+    if (path != NULL) {
+        gtk_tree_view_scroll_to_cell(tree_view, path, NULL, FALSE, 0, 0);
+        gtk_tree_path_free(path);
+    }
 
     bindex->scroll_to_row_idle_id = 0;
 
@@ -1393,8 +1395,10 @@ bndx_expand_to_row_and_select_idle(BalsaIndex *bindex)
     gtk_tree_row_reference_free(bindex->reference);
     bindex->reference = NULL;
 
-    bndx_select_row(bindex, path);
-    gtk_tree_path_free(path);
+    if (path != NULL) {
+        bndx_select_row(bindex, path);
+        gtk_tree_path_free(path);
+    }
 
     return G_SOURCE_REMOVE;
 }