Remove Double Comma from Array

I am building an HTML table with Arrays with an Apply to All within an Apply to All.

My final output looks like this

<table>,<tr>,<td colspan=\"7\">Franklin</td>,</tr>,,
<tr>,<td>Cristhian</td>,<td></td>,<td></td>,<td></td>,<td></td>,<td></td>,<td>Sep 12 01:20 PM</td>,</tr>,,
<tr>,<td>Isaac</td>,<td>1</td>,<td>Lorem</td>,<td></td>,<td></td>,<td>Nam eget dui quis nibh maximus efficitur.</td>,<td>Sep 13 07:50 AM</td>,</tr>,,
<tr>,<td>Vivaldo</td>,<td>1</td>,<td>ipsum</td>,<td></td>,<td></td>,<td>Aliquam quis lacus lacus.</td>,<td>Sep 13 02:25 PM</td>,</tr>,,
<tr>,<td>Cristhian</td>,<td>1</td>,<td>ipsum</td>,<td></td>,<td></td>,<td>Mauris vitae urna vitae neque.</td>,<td>Sep 13 02:29 PM</td>,</tr>,,
<tr>,<td>Nicole</td>,<td>1</td>,<td>Lorem</td>,<td></td>,<td></td>,<td>Quisque nec fermentum magna.</td>,<td>Sep 13 02:32 PM</td>,</tr>,,
</table>

Using Join comma (,) I can turn it into this

<table>
<tr><td colspan="7">Franklin</td></tr>","<tr><td>Cristhian</td><td></td><td></td><td></td><td></td><td></td><td>Sep 12 01:20 PM</td></tr>","
<tr><td>Isaac</td><td>1</td><td>Lorem</td><td></td><td></td><td>Nam eget dui quis nibh maximus efficitur.</td><td>Sep 13 07:50 AM</td></tr>","
<tr><td>Vivaldo</td><td>1</td><td>ipsum</td><td></td><td></td><td>Aliquam quis lacus lacus.</td><td>Sep 13 02:25 PM</td></tr>","
<tr><td>Cristhian</td><td>1</td><td>ipsum</td><td></td><td></td><td>Mauris vitae urna vitae neque.</td><td>Sep 13 02:29 PM</td></tr>","
<tr><td>Nicole</td><td>1</td><td>Lorem</td><td></td><td></td><td>Quisque nec fermentum magna.</td><td>Sep 13 02:32 PM</td></tr>","
</table>

I'm trying to get rid of the remaining commas. I thought using a Join again, but I got an error:

InvalidTemplate. Unable to process template language expressions in action 'Join_2' inputs at line '0' and column '0': 'Error setting value to 'From' on 'Microsoft.Azure.Workflows.Data.Operations.JoinActionInput'.'.

How can I get rid of the remaining commas?

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