Silence loplugin:unnecessarycatchthrow with --disable-debug

(An alternative fix could be to suppress warnings for catch blocks containing
preprocessor conditionals, but as these two places seem to be the only ones
affected, keep it simple for now.)

Change-Id: Ia83e56d1eab69bb2920ffdbbfc2182addce47963
Reviewed-on: https://gerrit.libreoffice.org/47331Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

basic/source/uno/namecont.cxx

@@ -1926,24 +1926,26 @@ void SfxLibraryContainer::storeLibraries_Impl( const uno::Reference< embed::XSto
                 uno::Reference< embed::XStorage > xLibraryStor;
                 if( bStorage )
                 {
+#if OSL_DEBUG_LEVEL > 0
                     try
                     {
+#endif
                         xLibraryStor = xTargetLibrariesStor->openStorageElement(
                                                                         rLib.aName,
                                                                         embed::ElementModes::READWRITE );
+#if OSL_DEBUG_LEVEL > 0
                     }
                     catch(const uno::Exception& )
                     {
-                        #if OSL_DEBUG_LEVEL > 0
                         Any aError( ::cppu::getCaughtException() );
                         SAL_WARN(
                             "basic",
                             "couldn't create sub storage for library \""
                                 << rLib.aName << "\". Exception: "
                                 << comphelper::anyToString(aError));
-                        #endif
                         throw;
                     }
+#endif
                 }
 
                 // Maybe lib is not loaded?!
@@ -2319,8 +2321,10 @@ void SAL_CALL SfxLibraryContainer::loadLibrary( const OUString& Name )
         uno::Reference< embed::XStorage > xLibraryStor;
         if( bStorage )
         {
+#if OSL_DEBUG_LEVEL > 0
             try
             {
+#endif
                 xLibrariesStor = mxStorage->openStorageElement( maLibrariesDir, embed::ElementModes::READ );
                 SAL_WARN_IF(
                     !xLibrariesStor.is(), "basic",
@@ -2340,19 +2344,19 @@ void SAL_CALL SfxLibraryContainer::loadLibrary( const OUString& Name )
                 {
                     throw uno::RuntimeException("null returned from openStorageElement");
                 }
+#if OSL_DEBUG_LEVEL > 0
             }
             catch(const uno::Exception& )
             {
-            #if OSL_DEBUG_LEVEL > 0
                 Any aError( ::cppu::getCaughtException() );
                 SAL_WARN(
                     "basic",
                     "couldn't open sub storage for library \"" << Name
                         << "\". Exception: "
                         << comphelper::anyToString(aError));
-            #endif
                 throw;
             }
+#endif
         }
 
         Sequence< OUString > aNames = pImplLib->getElementNames();