metadata: catch std::exception instead of Exiv2::AnyError for better robustness

(cherry picked from commit 0e2d9332f633b060bd4d5cbcd9d47009bab0c46c)

rtgui/exifpanel.cc

@@ -233,7 +233,7 @@ void ExifPanel::refreshTags()
         for (const auto& p : *changeList) {
             try {
                 exif[p.first] = p.second;
-            } catch (const Exiv2::AnyError& exc) {
+            } catch (const std::exception& exc) {
             }
         }
 
@@ -258,7 +258,7 @@ void ExifPanel::refreshTags()
                 addTag(tag.key(), tag.tagLabel(), tag.print(&exif), false, false);
             }
         }
-    } catch (const Exiv2::AnyError& exc) {
+    } catch (const std::exception& exc) {
         return;
     }
 

rtgui/iptcpanel.cc

@@ -502,7 +502,7 @@ void IPTCPanel::setImageData (const FramesMetaData* id)
                     (*embeddedData)[tag.key()].push_back(tag.toString());
                 }
             }
-        } catch (const Exiv2::AnyError& exc) {
+        } catch (const std::exception& exc) {
             embeddedData->clear();
         }
     }

rtgui/thumbnail.cc

@@ -1231,7 +1231,7 @@ void Thumbnail::saveMetadata()
             std::cout << "saved edited metadata for " << fname << " to "
                       << fn << std::endl;
         }
-    } catch (Exiv2::AnyError &exc) {
+    } catch (std::exception &exc) {
         std::cerr << "ERROR saving metadata for " << fname << " to " << fn
                   << ": " << exc.what() << std::endl;
     }