Modify installer db calls to remove IF EXISTS

IF EXISTS is not correct in MariaDb v5, used in all FreePbx Packages.

Author: stevenLAD

install.php

@@ -433,7 +433,7 @@ function InstallDB_updateSchema($db_config)
         }
         // Processed all _Column names; now safe to delete them
         $sqlDrop = array_reduce($fieldsArr, function($carry, $column) {
-                return "${carry} DROP COLUMN IF EXISTS ${column},";
+                return "${carry} DROP COLUMN ${column},";
         });
         $sqlDrop = rtrim($sqlDrop, ", ");
         $stmt = $db->prepare("ALTER TABLE ${table} ${sqlDrop}");
@@ -463,7 +463,7 @@ function InstallDB_updateSchema($db_config)
                 // occur as columns that are dropped should no longer be in the module.xml schema
                 // and so Doctrine will have already dropped them.
                 if (!empty($tab_modif[$fld_id]['drop'])) {
-                    $sql_create .= "DROP COLUMN IF EXISTS {$row_fld}, ";
+                    $sql_create .= "DROP COLUMN {$row_fld}, ";
                     unset($tab_modif[$fld_id]['drop']);
                     continue;
                 }

module.xml

@@ -1,7 +1,7 @@
 <module>
 	<rawname>sccp_manager</rawname>
 	<name>SCCP Manager</name>
-	<version>14.4.0.1</version>
+	<version>14.4.0.2</version>
 	<type>setup</type>
 	<category>SCCP Connectivity</category>
 	<publisher>Steve Lad, Alex GP</publisher>
@@ -38,6 +38,7 @@
 		 * Version 14.3.0.30 * - Fix reversion in 29. Not returning to correct page when saving device.
 		 * Version 14.3.0.31 * - Fix rewrite rules.
 		 * Version 14.4.0.1 * - Modify installer to avoid data loss on existing 14.3 fields. Bump Minor version to reflect this.
+		 * Version 14.4.0.2 * - Revert error in Installer db calls - IF EXISTS is not valid in MariaDb v5 (package DB)
 	</changelog>
 	<location>https://github.com/chan-sccp/sccp_manager</location>
 	<depends>