Description:

In step 3 of Mail Marge ,click "Select Address List" button, then click "Add". If file's name of Calc has one or more dots,the Wizard can't read file.

Steps:
 
 1: Create a new Calc's file.
 2: Save it with a dot in the file's name.
 3: Open writer.
 4: Tools>Mail Merge Wizard.
 5: Select "use the current document" , press next.
 6: Select "E-mail message", press next.
 7: Click "Select Address List", then click "Add".
 8: Select the created in the step one.

Expected behavior:
When I select the file and I press "open", the Wizard's step 3 add the file and creates the table and I can proceed with the next step.

Current behavior:
When I select the file and I press "open", the Wizard's step 3 add the file but I can't proceed with the next step.

Affected version:
Version: 5.1.3.2
Build ID: 644e4637d1d8544fd9f56425bd6cec110e49301b
CPU Threads: 2; OS Version: Linux 4.1; UI Render: default; 
Locale: it-IT (it_IT.UTF-8)
OS: openSUSE Leap 42.1 (x86_64)

Version: 5.3.0.0.alpha0+
Build ID: a8bd44573b75d1399257d6f5d052611439607189
CPU Threads: 2; OS Version: Linux 4.1; UI Render: default; 
TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:master, Time: 2016-06-13_23:46:49
Locale: it-IT (it_IT.UTF-8)
OS: openSUSE Leap 42.1 (x86_64)

Versione: 5.2.0.0.beta2
Build ID: ae12e6f168ba39f137fc110174a37c482ce68fa4
Thread CPU: 2; Versione SO: Linux 4.1; Resa interfaccia: predefinito; 
Versione locale: it-IT (it_IT.UTF-8)
OS: openSUSE Leap 42.1 (x86_64)

Works on:
Versione: 4.3.7.2
Build ID: 8a35821d8636a03b8bf4e15b48f59794652c68ba
OS: openSUSE Leap 42.1 (x86_64)

Versione: 4.4.7.2
Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Versione locale: it_IT.UTF-8
OS: openSUSE Leap 42.1 (x86_64)

Versione: 5.0.6.3
Build ID: 490fc03b25318460cfc54456516ea2519c11d1aa
Versione locale: it-IT (it_IT.UTF-8)
OS: openSUSE Leap 42.1 (x86_64)